Core Color : Black Wheel Diameter : 4.000 IN (102.000 MM) 4 inches Included : (4) Swivel, (16) 3/8-16 x 1 inches self-threading mounting screws (Cat# 06291) Wheel Width : 2 inches Wheel Material : Polyolefin Capacity per Wheel : 400 pounds Type : 4 Swivel Caster Set