Polyurethane resists most chemicals, oils and rejects floor debris. Side Lock Brake Caster FactorDuty 3 Inch Wheels Rigid Fixed None Swivel Industrial Grade Heavy Duty Polyurethane Caster QUALITY: These wheels are made of precision molded solid polyurethane These polyurethane wheels offer easy roll-ability, floor protection, non-marking and non-conductive performance. These polyurethane wheels offer easy roll-ability, floor protection, non-marking and non-conductive performance. Caster Wheel Diameter: 50mm , 1., 5(40mm). Hole center to hole center:, 1., 2., (32mm) x 1., 9(49mm., Mounting hole dimensions: 0., 23(6mm) X 0., 32(8., 2mm. The side brake locks the wheel. HEAVY DUTY BEARINGS: Steel structures body is extremely hard wearing and resistant to dirt, Bearing Heavy Duty. Our industrial wheels are ready for your heavy duty project. 5 Inch Heavy Duty Polyurethane Wheels Swivel Industrial Casters Red They're seriously tough - each one can support up to 200 pounds, meaning your whole cart can haul a massive 800 pounds without breaking a sweat. What makes... Caster Wheel Material: Polyurethane., Overall Height: 57mm, 2., 2. 6 Inch Polyurethane Caster Wheels- Polyurethane on Polyolefin Core Wheel with Double Roller FEATURES: These Low Profile Caster Wheels give you the ability to Carry items of very heavy capacity while staying low profile. Caster Wheel Color: Black.