BuroRoll Office Chair Caster Wheels (5X) / 2.5" Rollerblade Wheel/Perfect casters for All Floors Including Hardwood, Carpet, Laminate & Wood Floors/Heavy Duty/Universal stem Size (Black/Black) SAY HELLO TO PREMIUM BUROROLLS & GOODBYE TO REGULAR OFFICE CHAIR CASTORS - BUROROLL Premium replacement wheels not only give your chair an elegant look but also glide smoothly across hard floors. Say goodbye to your chair mat for good! ANTI-SCRATCH WHEELS and ANTI-ABRASION wheels ensure quiet & steady rolling without the worry of damage to hard floors such as vinyl, hardwood, tiles, laminate, polished concrete etc. STANDARD SIZE stem to fit most standard chair bases with 7/16" diameter x 7/8" length push-in grip ring stem size and 2.5" diameter wheels. ** Please note these will not fit IKEA office chairs which require stems of 13/32" (10mm) ** PREMIUM QUALITY & STYLISH HOODED DESIGN - Strong steel body supports 50 kg per wheel and 250 kg per set. Looks great on both shiny or black or grey chair bases. BUROROLLS make a superior replacement for standard hard nylon office chair castors that come with most office chairs. 100% SATISFACTION GUARANTEE or your money back!