PACKAGE: Included 4 casters.BIG TIRE: 2'' Diameter Wheel.LOAD CAPACITY: Total 800 lbs (200 lbs each caster).MATERIALS: Premium Polyurethane / Steel.UNIVERSAL:Perfect casters replacement for your wire rack shelving units. Also It can make your workbench, freezer, grill, fire pit, cooler, washer, dryer,grinder/ drill press stand,compressoror any other gadget you need move easily and roll smoothly, which save your labor and time. Product Description Finnhomy Swivel Caster Wheels-Heavy duty, durable and anti-wear. Perfect caster wheels replacement for your wire rack shelving units. Also It can make your workbench, freezer, grill, fire pit, cooler, washer, dryer,grinder/ drill press stand,any other gadget you need move easily and roll smoothly, which save your labor and time. The structure chart of 5/16"- 18x1" : Package content: 4 x Caster Wheels with ScrewsMaterial: Polyurethane and SteelWheel Size: 2'' DiameterBearing: RollerFeatures: Heavy duty, durable and anti-wear With Braking NO NO NO Wheel Size 3 INCH 3 INCH 3 INCH 3 INCH 4 INCH 4 INCH Stem Size 3/8"- 16x1" 3/8"- 16x1" 1/2"- 13x1" 1/2"- 13x1" 3/8"- 16x1" 3/8"- 16x1" Quantity 4 4 4 4 4 4 Load Capacity of 4 2200 lbs 2200 lbs 2200 lbs 2200 lbs 2200 lbs 2200 lbs With Screws 360° Rotation With Braking NO NO NO Stem Size 5/16"- 18x1" 5/16"- 18x1" 3/8"- 16x1" 3/8"- 16x1" 1/2"- 13x1" 1/2"- 13x1" Wheel Size 2 INCH 2 INCH 2 INCH 2 INCH 2 INCH 2 INCH Load Capacity of 4 800 lbs 800 lbs 800 lbs 800 lbs 800 lbs 800 lbs Quantity 4 4 4 4 4 4 360° Rotation With Screws with Braking NO NO NO Stem Size 5/16" -18 x 1-1/2" 5/16" -18 x 1-1/2" 3/8" -16 x 1-1/2" 3/8" -16 x 1-1/2" 1/2" -13 x 1-1/2" 1/2" -13 x 1-1/2" Quantity 4 4 4 4 4 4 Load Capacity of 4 720 lbs 720 lbs 720 lbs 720 lbs 720 lbs 720 lbs With Screws 360° Rotation With Braking NO NO NO Size 2 Inch 2 Inch 3 Inch 3 Inch 4 Inch 4 Inch Quantity 4 4 4 4 4 4 Load Capacity of 4 800 lbs 800 lbs 2200 lbs 2200 lbs 2600 lbs 2600 lbs With Screws 360° Rotation