S-WH-82AYB Hamilton Series WH Workhorse Caster. Drop forged steel swivel caster construction includes a 3/4" diameter integrally forged steel kingpin (guaranteed for life!), and a precision secondary load bearing. CNC-Machined 2-9/16" diameter raceway with 3/8" hardened and polished steel balls. 3/4" precision tapered thrust bearing counteracts radial thrust. Ball check lubrication fittings in swivel assembly and in wheel hubs with tapered or straight roller bearings. Wheel - 8" x 2" Polylast round tread 95 Shore A polyurethane on aluminum with precision ball bearings Capacity - 1000 pounds Height - 9-1/2" Top Plate - 4" x 5" Bolt Holes - 3" x 3" slotted to 2-5/8" x 3-5/8" Mounting Bolt Diameter - 3/8"