Wheel Diameter: 10" (Click link to find similar sized casters)Tread Width: 3"Material: V-Groove (7/8) Ductile SteelLoad Rating (Per Item): 6000 poundsFinish: ZincConnector Specs: Plate (5-1/4"x7-1/4"; holes: 3-3/8"x5-1/4" slots to 4-1/8"x6-1/8"; 1/2" bolt)Bearing: Roller BrngLoad Height: 12-1/2"Swivel Radius: N/AShipping Weight: 30 lbs.Usually Ships in: 7-10 business days (may be affected by quantity ordered)Heavy Duty Kingpinless series, featuring: • Larger 5-1/4 x 7-1/4 plate standard • ASTM1045 drop forged swivel head, 5/16" thick, 3" diameter precisely machined raceway of 1/2" diameter hardened ball bearings • Legs are double welded 3/8" thick steel • 3/4" axle bolt/nut • Zinc-plated finish • Grease fitting on raceway and axle • Variety of brakes, position locks, thread guards and toe guards available • RoHS Compliant