3" x 1-1/4" Hollow Kingpin Swivel Caster | Thermoplastic Rubber Wheel |210 lbs CapacityHollow Kingpin Casters are also known as Stemless Casters and Bolt Hole Casters This listing is for a 3" x 1-1/4" Hollow Kingpin Caster, also known as a Stemless Caster or a Bolt Hole Caster. This caster has a tubular rivet in the center of the caster to allow any stem type and size 1/2" diameter and under. This is made to accommodate your custom or unique stem size so you can quickly adapt and attach casters to your equipment or cart. Wheel Type:Thermoplastic Rubber wheels are non-marking, non-marring, absorb shock and vibrations and will protect your equipment or cart. Thermo Rubber Wheels are easy to roll, quiet, and great for concrete, outdoors, and gravel, and they can roll over debris a lot easier than harder wheels. TECHNICAL SPECIFICATIONS: CASTER TYPE: HOLLOW KINGPIN / STEMLESS CASTER / BOLT HOLE CASTER WHEEL DIAMETER: 3" WHEEL TREAD WIDTH: 1-1/4" HOLLOW KINGPIN BOLT-HOLE SIZE: 1/2" INNER DIAMETER BOLT HOLE (FITS ANY STEM 1/2" AND UNDER) OVERALL HEIGHT: 4-1/8" (FROM BOTTOM OF WHEEL TO TOP OF RACEWAY AFTER INSTALLATION) SWIVEL RADIUS: 4-7/8" WEIGHT CAPACITY: 210 LBS PER WHEEL BEARING TYPE: