Mounting options include top plate, bolt hole, expanding stem and standard and metric threaded stem sizes.
Listing is for a set of four (4) Service Caster Series #20 1-3/4" expanding stem 316 stainless steel swivel casters, two (2) with total locking brakes, with 3" diameter by 1-1/4" wide blue polyurethane wheels capable of supporting a total weight of 1,000 lbs. The non-marking, non-marring polyurethane wheels perform especially well on hard surfaces such as concrete, tile, and wood. 3 Inch 316SS Blue Poly Swivel 1-3/4 Inch Expanding Stem Caster Lock Brake, 2PK SS316 casters are ideal for light and medium duty material handling, carts, equipment, and shop projects..