Product Name : Caster Wheel;Material : Plastic, MetalFixing Stem Size : 1cm x 2.5cm/ 0.4" x 1"(D*H);Wheel Diameter : 5.1cm/ 2"Total Size (Approx.) : 6.8*8cm(D*H);Color : BlackWeight : 80gFeatures a 360 degree swivel mounting plate attached to a double wheel roller system.Caster Wheel is perfect replacement for your broken one on your office chair.Package Content : 1 x Caster WheelNote:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.