Maintenance-Free High-Performance Friction-Ring Stem Caster Swivel Caster with Total Lock 190 lb Load Rating 0 to 299 lb 4 in Wheel Dia 1 1/4 in Wheel Width Polyolefin Wheel/Tread Material 5 13/16 in Mounting Height Precision Ball 7/16 in x 1-7/16 in Caster Stem Size Friction Ring Nylon Caster Frame Material No Finish Frame Finish Yes Non-Marking 1 Number of Wheels