These casters are made with premium cast iron Albion wheels, sometimes referred to as semi-steel, which offers the highest tensile strength in the industry (30,000 psi). The cold forged caster rigs are equipped with ball-bearing rollers for smooth and efficient operation and can be greased as needed. Combined, they provide a cost-effective solution for high-capacity applications. Albion Wheel Features: Wheel Face: Machined flat with rounded edges Finish: Grey Enamel Temperature Range: up to 800*F Hardness: Brinell 145 Caster Rig Features: 1/4? Cold forged steel Zinc plating Wheel Diameter: 6 Wheel Material: Cast Iron Overall Height: 7-1/2 Tread Width: 1-7/8 Top Plate Size: 4 x 4-1/2 Load Capacity: 1250 Pounds Per Caster Color Grey Brand Name Cass Hudson Unit Count 1 Count Caster Type Rigid Item Weight 8 Pounds Part Number 34-CA-06201R Wheel Width 2 Inches Manufacturer Albion Load Capacity 1250 Pounds Material Type Cast Iron Mounting Type Plate Mount Surface Recommendation Multi-Surface