Replacement Office Chair Caster Wheels Rubber PU 2" ,Standard Stem Size 7/16"(11mm) 7/8"(22mm) Compatible with Most Chairs, 5 Unit/Pack Dark Gray UNIVERSAL FIT-The stem diameter is 7/16" (11mm); stem length is 7/8" (22mm) which will fit into most chair models SUPERIRO QUALITY-Material: Rubber PU 2,These padded casters are made using the finest polyurethane material available HEAVY DUTY-Maximum Weight Rating: 100lbs per wheel each and 500 lbs as a set of 5 FLOOR PROTECTION-Rubber wheels protect hardwood, laminate, tile, slate, and all other hard floor surfaces SATISFACTION WARRANTY-Each package contains five (5) wheels-Easy pull and snap installation-Meet ANSI/BIFMA standard-Lifetime Warranty