uxcell Chair Swivel Casters M10 Threaded Stem 1.5-Inch Diameter Twin Wheels, Pack of 5 Main Material: Nylon, Metal; Package Content: 5pcs x Thread Stem Caster Wheel Product Name: Thread Stem Caster Wheel; Weight: 252g Features: Twin Wheel; Main Color: Black Overall Size: 5 x 4.5 x 6.8cm/ 2" x 1.8" x 2.7" (L*W*H); Wheel Size: Each: 4 x 1cm/ 1.5" x 0.4"(D*T) M10 (Metric)threaded stem