RWM Casters 45 Series Plate Caster, Swivel, Cast Iron Wheel, Roller Bearing, 800 lbs Capacity, 4" Wheel Dia, 2" Wheel Width, 5-5/8" Mount Height, 4-1/2" Plate Length, 4" Plate Width 5-5/8" Overall height, 1-3/8" swivel lead, 800lbs capacity Cast Iron wheel with roller bearing 2-5/8" x 3-5/8" slotted to 3" x 3" bolt hole spacing for 3/8" diameter bolt Dual ball bearing raceways with a 5/8" diameter thread and bolt style kingpin Bright zinc plate for corrosion resistance