Wheel Diameter: 8" (Click link to find similar sized casters)Tread Width: 3"Material: V-Groove (1-3/8) Cast IronLoad Rating (Per Item): 2000 poundsFinish: ZincConnector Specs: Plate (4-1/2"x6-1/4"; holes: 2-7/16"x4-15/16" slotted to 3-3/8"x5-1/4"; 1/2" bolt)Bearing: Roller BrngLoad Height: 10-1/8"Swivel Radius: 6-1/4"Shipping Weight: 30 lbs.Usually Ships in: 7-10 business days (may be affected by quantity ordered)Heavy Duty Forged series, featuring: • Larger 4-1/2 x 6-1/4 plate standard • Drop forged (ASTM1045) 3/8" thick swivel head • Integrally forged kingpin 3/4" diameter • Lower raceway thrust bearing is a tapered roller bearing, providing exceptionally smooth and easy swiveling action and counteracts radial thrust. • 7/16" 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