uxcell Office Chair M10 x 15mm Threaded Stem Nylon 2" Swivel Twin Caster Wheels 5pcs Material: Nylon, Metal; Package Content: 5pcs x Thread Stem Caster Wheel Product Name: Thread Stem Caster Wheel; Weight: 342g Features: Twin Wheel; Main Color: Black Overall Size: 73 x 6 x 4.5cm/ 3.1" x 2.4" x 1.8" (L*W*H); Wheel Size: 5 x 1.2cm/ 2" x 0.5"(D*T) Thread Size: M10 x 15mm(D*L)