Uxcell a15042400ux0064 2" Twin Wheel M8 Threaded Stem Brake Swivel Nylon Casters 5pcs Main material: nylon, metal; Package Content: 5Pcs x thread stem caster wheels Product Name: thread stem caster wheel; weight: 377G Features: twin wheel; main Color: black Overall size: 6 x 4.5 x 7.3cm/2.4" x 1.8" x 2.9" (l*w*h); wheel size: each: 5 x 1.2cm/2" x 0.5"(D*t) Threaded stem size: 8 x 15mm (d*l)