casters new! item price farm blue diamond thermoplastic polyurethane casters wheel wheel load brake type overall wt rigid swivel swivel rigid swivel swivel foot rigid swivel swivel foot toolbox casters wheel load brake type overall height item price foot pneumatic casters wheel brake type overall stem swivel load item price rigid swivel rigid swivel post gex gate casters cachex tri-dollies type capacity wheel wt item price hard rubber 125 pneumatic