This rigid plate caster has a grey wheel measuring 1 1/4 x 5 inches and a load rating of 350 pounds. Each medium-duty caster has a double ball raceway swivel sub-type and a zinc frame. 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. Use item number WPP5BG for replacement wheels.