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Office Chair Caster Parking Cup
This is an 80 mm dished floor cup that stops an office chair caster from rolling. It holds single or twin-wheel casters from 50 to 65 mm across and up to 26 mm wide in a 9 mm-deep bowl, so the chair stays put on hard floors at a desk or standing desk and the floor doesn't get scuffed. The body is 12 mm tall, the floor is 3 mm thick, and the rim is flat and sloped so a wheel rolls in with a nudge but won't roll out by itself.
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