This rigid caster wheel has a non-rigid swivel radius, standard tread shape, and glass-filled nylon wheel tread. This caster wheel has a zinc frame, light to medium load capacity of 400 pounds, and measures 1 1/2 x 3 1/2 inches. The mounting plate is 4 1/8 x 2 15/16 inches, the mounting bolt is 6/16 inches in diameter, with inside and outside bolt hole spacing of 1 3/4 x 2 15/16 inches. This black, non-marking, lockless caster, has steel frame material.