A B Bore Dia.: 1/2", 3/4" , Caster Load Rating Range: 300 to 999 lb. , Caster Temp. Range Available: Yes , Caster Wheel Material: Rubber , Core Color: Black , Core Material: Cast Iron , Durometer: 75 Shore A , Fits Axle: 1/2" , Hub Length: 2.187" , Non-Marking: No , Resistant To: Water, Oil, Chemicals, Most Acids , Spanner Bushing: Included , Temp. Range: -40 Degrees to 180 Degrees F , Wheel Bearings: Roller , Wheel Color: Black , Wheel Material: Rubber , Wheel Width: 2"