Product_description: ['HAMILTON ForgeMaster CastersA feature precision tapered thrust bearings placing them among the top double-ball race casters on the market today. -3/8" thick drop forged steel mounting plate. -5/16x2-1/2" plate steel legs are robotically welded inside and outside to forged steel horn base. Sturdy 1" diameter integrally forged kingpin with mounting plate. Main load bearing is 3-1/4" diameter CNC-machined raceway; secondary load bearing has 1" precision tapered thrust bearing that counteracts radial thrust. -3/4" diameter axle. Ball check type lubrication fittings in swivel assembly and wheel hubs.']

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