Hamilton EHD Caster. Wheel: 6" x 3" Duralast XC polyurethane (70D)on cast iron wheel with precision ball bearings Capacity: 2,860 pounds Height: 8-1/2" Top Plate: 5-1/2" x 7-1/2" Bolt Holes: 4-1/8" x 6-1/8" for 1/2" mounting bolts Construction: 3/8" x 3" legs welded inside and out to 1/2" top plate Finish: Red enamel Axle: 3/4" diameter hex head with lock nut