The listing is for a set of four (4) service caster series #20 1-7/8" expanding stem swivel casters, two (2) with top locking brakes, with 3-1/2" diameter by 1-1/4" wide blue polyurethane wheels capable of supporting a total weight of 1,200 lbs. (300 lbs./caster).
- Wheel hardness: 60 Shore D durometer