Office Chair Armrest Riser Spacer
A 20 mm ribbed spacer that sits between an office chair's armrest bracket and its pad to raise the armrest for taller users or a too-low chair. Footprint is 92 x 54 mm with a 7 mm wide, 74 mm long slot through both faces, so it takes M5, M6 or #10-24 chair screws at any spacing up to 67 mm apart — measure your pad screws first and buy screws 20 mm longer than stock. Hollow rib grid inside, flat contact faces both sides, stack two for 40 mm.
desk office-chair armrest ergonomics