Listing is for a set of four (4) Service Caster Series #20 316 stainless steel swivel bolt hole casters, four (4) swivel casters with total lock brakes, 5â diameter by 1-1/4â wide nylon wheels. Mounting options include top plate, bolt hole, expanding stem and standard and metric threaded stem sizes. SS316 casters are ideal for light and medium duty material handling, carts, equipment, and shop projects.5 Inch 316SS Nylon Wheel Swivel Bolt Hole Caster Set Supports a total weight of 1,200lbs (300lbs/per caster).