uxcell Computer Chair 41mm Twin Wheel 360 Degree Rotation Swivel Caster x 4 Product Name : Caster Wheel;Type : Rotatable, Dual Wheel, Square Top Plate;Material : Nylon, Metal Color : Black, Silver Tone;Screw Hole Distance(Approx.) : 2.5cm / 1" (Centre to Centre) Hole Dia (Each) : 4.5mm / 0.18";Wheel Size : 41 x 1.2mm / 1.6" x 0.47" (D*T) Top Plate Size : 3.5 x 3.5 x 0.15cm / 1.4" x 1.4" x 0.06"(L*W*T);Overall Size : 5.5x 5x 4cm / 2.2" x 2" x 1.6"(L*W*H) Net Weight : 215g;Package Content : 4 x Caster Wheel