Listing is for 1 (One) Service Caster 6" x 2.5" Polyurethane on Cast Iron Keyed Drive Wheel.
Bore Diameter:1-1/4"
Hub Length: 3-1/4"
Tread Durometer: 90-95 Shore (A)
Wheel comes standard with 2 set screws. One on the keyway and one 90 degrees from it.