This swivel caster has a grey wheel measuring 1 1/4 x 5 inches and features an adjustable total lock. Each medium-duty caster has a load rating of 350 pounds and a double ball swivel raceway type. The mounting plate measures 4 1/8 x 3 3/8 inches, with a 5/16-inch mounting bolt diameter and an inside/outside bolt hole spacing of 2 3/8 x 3 1/8 inches. The frame is made from zinc with a zinc finish. Use item number WPP5BG for replacement wheels.