
The Office Master KR-200 is the height- and width-adjustable T-arm in OM's Group 1 range, the middle step, and the one most people land on when fixed arms are too rigid but a full 4D arm is more than the job needs. Adding width adjustment matters more than it sounds: it lets the arms move in for a narrower sitter or out to clear hips, which is usually what makes an armed chair comfortable rather than merely armed.
The KR-200 is a Group 1 arm, so it fits Office Master chairs specified to take Group 1 arms, which covers most of the Classic, Paramount and Affirm task ranges.
If you are buying a new chair rather than retrofitting one, you do not need to order arms here: KR-200 arms can be selected as an option on the chair's own product page, and the upcharge is shown there. This listing is for adding or replacing arms on a chair you already have.
Retrofitting an existing chair? Talk to our team with your chair's model number and we will confirm the correct arm kit and quantity before anything ships.
Office Master products are BIFMA LEVEL® certified and GREENGUARD certified. Pricing and specifications are set by the manufacturer and subject to change.