Uxcell a15042400ux0027 Black 2" Twin Wheel 3/8" Thread Stem Brake Swivel Nylon Casters (10 Piece) Main material: nylon, metal; Package Content: 10Pcs x thread stem caster wheels Product Name: thread stem caster wheel; weight: 780G Features: twin wheel; main Color: black Overall size: 6 x 4.5 x 8cm/2.4" x 1.8" x 3.1" (l*w*h); wheel size: each: 5 x 1.2cm/2" x 0.5"(D*t) Threaded stem size: 10 x 15mm/3/8" x 5/8"(d*l)