uxcell 8mm Threaded Stem 40mm Dual Wheel Rotatable Caster Black Product Name : Threaded Stem Caster Wheel;Type : 360 Degree RotationDual Wheel Wheel Size : 40 x 9mm / 1.6"x 0.35" (D*T);Total Size (Approx.) : 50 x 40 x 60mm / 2.0" x 1.57" x 2.36"(L*W*H) Threaded Stem Dia. : M8;Threaded Stem Length : 12mm / 0.47" Material : Plastic, Metal;Color : Black Weight : 46g;Package Content : 1 x Threaded Stem Caster Wheel