The Colebrook Bosson Saunders Flo Dual is two independent Flo monitor arms on a single dual-mount clamp, finished with a cover that hides the fixing screws. Each arm has its own Dual Rate Spring and carries its own screen of 2 to 7 kg, up to 34 inches flat or curved, so a heavier main screen and a lighter second screen are each set correctly and move on their own.
CBS Flo Dual
Two Screens, One Clamp
The Flo Dual is the Flo arm in its two-screen form: two independent arms on one dual-mount clamp. Each arm carries a screen of 2 to 7 kg, up to 34 inches, flat or curved to 1000R and above, with 483 mm of vertical travel and 582 mm of reach, so the two screens can sit side by side, angled in, or one higher than the other.
Because the arms are separate, a dual setup does not have to be a matched pair. A 27-inch main screen and a 24-inch reference screen are each tensioned for their own weight, and pushing one away does not drag the other with it.
The Desk Fitting
The Dual-Mount Clamp and Cover
Both arm posts drop into one split-mount clamp, and a moulded cover closes over the top to hide the fixing screws. CBS puts the clamp screws where you can reach them from above the desk, so the clamp is tightened from the work surface rather than from underneath, and a clamp pad grips the underside without marking it.
The clamp suits desks from 0 to 63 mm thick and has a configurable 180° stop, so the arms can be stopped short of a wall, a screen divider or the next desk on a bench. One fitting, one position on the desk edge, and both screens on it.
The Details
Five Things That Make It a Flo Dual
The clamp, the springs, the adjuster, the head and the cables.
One Dual-Mount Clamp
Both arms on one split-mount clamp with a cover over the fixings; desks 0–63 mm thick.
Two Dual Rate Springs
Each arm has its own spring, so each screen of 2–7 kg is set for its own weight.
A D-Ring on Each Arm
Tension is set arm by arm against a printed weight gauge, not by counting turns of a key.
Tilt and Rotate
VESA 75 and 100 head; tilt +30° up and −25° down; portrait or landscape.
Cables Held Properly
A cable cradle, a mid clip and removable side panels on each arm.
The Numbers
- Screens
- 2
- Per Arm
- 2–7 kg
- Screen Size
- Up to 34 in
- Reach
- 582 mm
- Height Travel
- 483 mm
- Warranty
- 12 years
Figures are from Herman Miller's Flo Dual product sheet and brochure (2025). Each figure is per arm.
Adjustment
Two Dual Rate Springs
A single-rate spring is a compromise: set it for a light screen and a heavy one sags, set it for a heavy one and a light screen floats. CBS's Dual Rate Spring changes its effective rate through the travel, so one arm covers 2 to 7 kg and holds position at both ends of that range.
On the Flo Dual there are two of them, one per arm. You set each with the diamond D-ring against a printed weight gauge, so the second arm can be matched to the first, or set differently for a different screen, in seconds.
Range of Movement
Reach, Height and Tilt for Each Screen
Each arm gives 582 mm of reach and 483 mm of vertical travel, with tilt of 30° up and 25° down and fingertip rotation between portrait and landscape. That covers a screen pulled in close for detail work, pushed back to clear the desk, or raised for standing at a sit-stand desk.
Screens up to 34 inches are supported, flat or curved to a 1000R radius and above, and the VESA head takes 75 and 100 mm hole patterns, which covers almost every office monitor.
Cable Management
Cables, Properly
Each arm carries its own cables: they clip in at the head, run along the arm and drop through a cable cradle at the post that holds the loop instead of letting it swing. CBS added a mid clip on the current generation, which stops the slack bellying out when a screen is pushed back.
The side panels come off, so cables can be laid in without threading, and the panels can be swapped if the finish needs to change.
Not the Same Product
Want Two Arms on a Post Instead?
CBS also makes the Flo Modular: Flo arms mounted on a vertical Wishbone post rather than side by side on a clamp. The post lets the arms sit higher without losing their lower adjustment, and more arms can be added later. It is a different product, sold separately, in silver or black.
If your screens need to sit high, or you may go to three screens, see the CBS Flo Modular Post-Mounted Dual. If you want two screens side by side from a low-profile desk fitting, this Flo Dual is the one.
Why We Stock CBS
Colebrook Bosson Saunders has been designing monitor arms in London since 1990 and is now part of MillerKnoll. Its arms turn up in fit-outs where somebody cared: the mechanism is quiet, the cable route is properly thought through, and the 12-year warranty says what CBS thinks of its own tolerances.
We stock CBS because it sits between a cheap arm that sags within a year and the most expensive arms on the market. Call 02 9640 0642 for a floor quote. Your rights under the Australian Consumer Law for faulty or damaged goods are separate and are not limited by it.
Features & Specifications
Key Features
-Two independent Flo monitor arms on a single dual-mount clamp, with a cover over the fixing screws
-Screen weight 2–7 kg (4.4–15.4 lb) per arm; screens up to 34 in, flat or curved (1000R and above)
-Per arm: vertical adjustment 483 mm; horizontal reach 582 mm; tilt +30° / −25°; portrait / landscape rotation
-VESA 75 and 100 mm compliant head
-Dual Rate Spring and D-ring adjuster with weight gauge on each arm
-Cable cradle, mid clip and removable side panels on each arm
-Split-mount dual clamp: desk thickness 0–63 mm; screws reached from above the desk; clamp pad; configurable 180° stop
-Clamp finish listed by Herman Miller: white or silver (black confirmed with your order)
-Flo arm: 49.5% recycled content and plastic-free packaging (Herman Miller)
-Warranty 12 years (CBS / Herman Miller)
Downloads
Herman Miller — Flo Dual product sheetPDF ↓Herman Miller — Flo Single and Flo Dual brochurePDF ↓Chair Dinkum — warranty termsLink →Dimensions
Screens2, independently adjusted
Screen Weight2–7 kg per arm
Screen SizeUp to 34 in, flat or curved (1000R and above)
Vertical Adjustment483 mm per arm
Horizontal Reach582 mm per arm
Tilt+30° / −25°
VESA75 and 100 mm
Desk Thickness0–63 mm (dual clamp)
Stop Function180°, configurable
Warranty12 years
Figures are from Herman Miller's Flo Dual product sheet and Flo Single and Flo Dual brochure (2025); reach and height are per arm. Herman Miller lists the dual clamp in white and silver; if you order black, we confirm the finish of the arms and clamp before it ships. Warranty terms are on our warranty page.
Frequently Asked Questions
Check three things: each screen's weight, its VESA hole pattern, and your desk's thickness where the clamp goes. Each Flo arm carries 2 to 7 kg, up to 34 inches flat or curved (1000R and above); the head takes VESA 75 and 100 mm; and the dual clamp suits desks 0 to 63 mm thick. If a screen has no VESA holes, send us the model on 02 9640 0642 and we will check before you order.
Two separate Flo arms, each with its own spring, adjuster and cable route, sharing one dual-mount clamp with a cover. That is why the two screens adjust independently and can be different sizes. It is not a crossbar, and it is not the Flo Modular, which puts the arms on a vertical post.
With the dual-mount split clamp supplied: both arm posts sit in one clamp at the desk edge, the screws are reached from above the desk, and a cover closes over them. It suits desks 0 to 63 mm thick. If your desk is thicker, has an edge beam in the way, or you need a through-desk fixing, send us a photo on 02 9640 0642 and we will tell you what works.
Yes. Each arm is tensioned for its own screen, so a 27-inch main display and a 24-inch secondary sit at whatever heights and angles suit you. Both need to be within 2 to 7 kg.
Choose the Flo Dual for two screens side by side from a low, single desk fitting. Choose the Flo Modular Post-Mounted Dual if the screens need to sit higher, for example at a tall sit-stand desk, or if you may add a third arm later; it mounts the arms on a Wishbone post and comes in silver or black.
Colebrook Bosson Saunders publishes a 12-year warranty on the Flo against defects in materials and workmanship in normal use. Claims come to Chair Dinkum on 02 9640 0642 and we lodge and manage them. Full terms are on our warranty page. Your rights under the Australian Consumer Law for faulty or damaged goods are separate and are not limited by it.
