V-Groove Semi Steel Caster

Listing is for a set of four (4) service caster series #20 casters, two (2) rigid and two (2) swivel casters with top locking brakes, with 6" diameter by 2" wide v-groove semi steel cast iron wheel with a bronze bearings capable of supporting a total weight of 1,800 lbs. (450 lbs./caster).