The Colebrook Bosson Saunders Flo Modular Post-Mounted Dual is two Flo arms mounted on a central Wishbone post. Mounting the arms on a post lets the screens sit higher without losing their lower adjustment, which suits tall sit-stand desks and stacked screens, and the post takes more arms later if you add screens. Each arm carries 2 to 7 kg, up to 34 inches flat or curved. Silver or black.
CBS Flo Modular Post-Mounted Dual
Two Arms, One Post
Flo Modular combines the Flo monitor arm with a central Wishbone post. In the dual configuration two Flo arms clamp to the post, one either side, and each carries its own screen of 2 to 7 kg, up to 34 inches flat or curved (1000R and above), with tilt of 30° up and 25° down and rotation between portrait and landscape.
Each arm has its own Dual Rate Spring, so two screens of different weights are each set correctly and move independently, while the post keeps them on one centre line.
Why a Post
Higher Screens Without Losing Range
On a clamp-mounted arm the arm's own travel sets how high a screen can go. On Flo Modular the arm can be fixed higher up the Wishbone post, which raises the whole range of movement: screens can sit higher for a tall user or a standing desk without giving up the lower positions.
It also means screens can be stacked or mixed, a landscape screen beside a portrait one, without a second desk fitting.
The Details
Five Things That Make It Flo Modular
The post, the springs, the adjuster, the head and the room to grow.
Wishbone Post
Arms mount anywhere along the post, raising the screens without losing lower adjustment.
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.
Tilt and Rotate
VESA 75 and 100 head; tilt +30° up and −25° down; portrait or landscape.
Add Arms Later
The same system runs to three, four or six screens on one post.
The Numbers
- Screens
- 2
- Per Arm
- 2–7 kg
- Screen Size
- Up to 34 in
- Finishes
- Silver, black
- Warranty
- 12 years
Figures are from Herman Miller's Flo Modular product sheet and brochure (2025). Each figure is per arm in the dual configuration.
Scalable
Start With Two, Add a Third
Flo Modular is built as a system. CBS supplies it for one, two, three, four or six screens, and arms can be added to or taken off the post as a desk's needs change, without replacing the whole arm.
Load limits change as screens are added: Herman Miller gives up to 7 kg and 34 inches per screen in single, dual and quad set-ups, and up to 5 kg and 27 inches flat per screen in triple and six-screen set-ups. Tell us where you might end up and we will spec the post and clamp to suit.
The Arm
The Same Flo Movement
Each arm is a Flo, with CBS's patented Dual Rate Spring and fingertip control for vertical, horizontal, tilt and rotation adjustment. Set each arm with the D-ring against its weight gauge and it holds the screen where you leave it.
Cables clip along each arm and down the post, so a two-screen desk ends up with one tidy cable run instead of two.
Not the Same Product
Want Two Arms on a Low Clamp Instead?
If you want two screens side by side from a low-profile desk fitting, CBS makes the Flo Dual: two Flo arms on one dual-mount clamp with a cover, no post. It is a different product, sold separately.
See the CBS Flo Dual. Choose the Modular when screens need to sit higher or you may add more.
Why We Stock CBS
Colebrook Bosson Saunders has been designing monitor arms in London since 1990 and is now part of MillerKnoll. Flo Modular is what CBS builds when a desk needs more than a pair of side-by-side screens: trading floors, control rooms, design and edit desks.
Call 02 9640 0642 for a floor quote or to spec a multi-screen post. 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 Flo Modular arms (CBS FLO/013/007) on one Wishbone post (CBS dual kit WSH/PST300/K)
-Screen weight 2–7 kg (4.4–15.4 lb) per arm; screens up to 34 in, flat or curved (1000R and above), in the dual configuration
-Tilt +30° / −25°; portrait / landscape rotation
-VESA 75 and 100 mm compliant head
-Dual Rate Spring and D-ring adjuster on each arm
-Arms mount anywhere along the post; more arms can be added later
-Desk fixing: CBS split clamp (0–68 mm) or top-mount clamp (12–25 mm); confirmed for your desk with the order
-Finishes: silver or black
-Warranty 12 years (CBS / Herman Miller)
Downloads
Herman Miller — Flo Modular product sheetPDF ↓Colebrook Bosson Saunders — Flo ModularLink →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)
Tilt+30° / −25°
VESA75 and 100 mm
Desk ThicknessSplit clamp 0–68 mm; top mount 12–25 mm
FinishesSilver, black
Warranty12 years
Figures are from Herman Miller's Flo Modular product sheet and brochure (2025) and CBS's Flo Modular page. CBS's documents give differing per-arm reach and height figures for Flo Modular, so we confirm them for your set-up rather than quote one. Warranty terms are on our warranty page.
Frequently Asked Questions
In the dual configuration each arm carries 2 to 7 kg, up to 34 inches flat or curved (1000R and above), and the head takes VESA 75 and 100 mm. Send us the two screen models on 02 9640 0642 and we will check them before you order.
The Flo Dual puts two arms side by side on one low dual-mount clamp with a cover. The Flo Modular Post-Mounted Dual mounts the arms on a vertical Wishbone post, which lets the screens sit higher without losing lower adjustment and takes more arms later. They are different products.
Yes. Flo Modular is a system: arms can be added to the post as needs change. Load limits change with the number of screens: Herman Miller gives up to 7 kg and 34 inches per screen for dual and quad, and up to 5 kg and 27 inches flat per screen for triple and six-screen set-ups. A taller post or a high-load clamp may be needed, and we spec that with you.
With a CBS desk clamp at the foot of the post: the split clamp suits desks 0 to 68 mm thick, the top-mount clamp 12 to 25 mm. For heavier multi-screen set-ups CBS makes high-load clamps. Send us a photo of the desk edge on 02 9640 0642 and we will confirm which one ships.
CBS makes Flo Modular in silver and black. There is no white Flo Modular.
Herman Miller lists a 12-year warranty on Flo Modular. 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.
