Wheel Diameter: 8" (Click link to find similar sized casters)Tread Width: 3"Material: V-Groove (7/8) Cast IronLoad Rating (Per Item): 3500 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: 10-1/2"Swivel Radius: N/AShipping Weight: 26 lbs.Usually Ships in: 7-10 business days (may be affected by quantity ordered)Heavy Duty Forged series, featuring: • Larger 5-1/4 x 7-1/4 plate standard • Drop forged (ASTM1045) 3/8" thick swivel head • Integrally forged kingpin 1" diameter • Lower raceway thrust bearing is a tapered roller bearing, providing exceptionally smooth and easy swiveling action and counteracts radial thrust. • 1/2" diameter hardened ball bearings as main load bearings, with precision tapered thrust bearings • 3/8" thick steel legs • Zinc-plated finish • 3/4" axle bolt with grease fitting • Variety of brakes, position locks, thread guards and toe guards available • RoHS Compliant