This light- to medium-duty caster has a load capacity of 250 pounds. Designed with a double ball bearing for better maneuverability, a 4-inch PolyLoc wheel with a tread width of 1 1/4 inches, and supported by a zinc frame. The mounting plate is 4 1/8 inches long a 3 3/8 inches wide with a bolt diameter of 5/16 inches. The bolt hole spacing measures 2 3/8 inches long and 3 1/8 inches wide.