casters catex farm phenolic casters straight roller bearings with grease nipple for easy rolling wheel overall wheel width load capacity brake type item price rigid swivel foot rigid swivel swivel rigid swivel foot swivel foot polyamide casters type item price wheel wheel load brake overall height wt rigid swivel swivel foot wheel item price precision-bearing polyurethane casters wheel type load capacity brake rigid swivel swivel overall stem stem foot swivel swivel foot threaded-stem swivel casters wheel wheel load overall type item price swivel swivel with brake swivel swivel with brake swivel with brake swivel swivel with brake