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Office Chair Armrest Strap-On Cup Holder
A cup holder that hangs off the side of an office or gaming chair armrest. It is held on by a 25 mm hook-and-loop strap or zip ties through two 4 × 27 mm slots in an 80 mm back plate, so it fits pads of any width with no drilling. The 91 mm bore takes mugs and tumblers up to about 90 mm. A raised 70 mm collar in the floor keeps a 66 mm can or slim bottle centred, and a 40 mm drain hole lets spills run out.
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