Uxcell a15042400ux0095 Thread Stem Caster Wheels 1.5 inch Twin Wheel M8x15mm Threaded Stem Brake Swivel Nylon Casters 2Pcs Main material: nylon, metal; Package Content: 2Pcs x thread stem caster wheels Product Name: thread stem caster wheel; weight: 102G Main Color: black; overall size: 5 x 4 x 6.5cm/2" x 1.6" x 2.6" (l*w*h) Wheel size: each: 4 x 1cm/1.5" x 0.4"(D*t) Threaded stem size: M8 x 15mm(d*l)