Package Includes 4 packs of 2” heavy-duty industrial casters, bolts x 10, nuts x 10, screws x 10, and washers x 10. Two installation ways that help save your time are to buy extras screws to install your workbench. PU Wheels & 360 Degree Rotation: Each of the workbench caster wheels are made from superior sturdy Polyurethane materials and is well constructed. You can glide the swivel casters effortlessly on wooden floors and carpet as you are guided around corners and through a couple of doorways. Safety: The 2 inches industrial swivel casters set of 4 are made of high-quality materials, firm and stable. You can easily control the wheels and direction to keep the workbench in place. In addition, these castors wheel sets are noiseless and don’t leave marks on hardwood or other flat finished surfaces to protect your floors well. Double Ball Bearings & Strong Load Capacity: All swivel casters set of 4 are double steel ball-bearing designed, which brings a maximum loading capacity of 500 lbs. Wheels roll and rotate smoothly from indoor flat surface to outdoor rugged place. Multiple Applications: The furniture workbench caster wheels can be widely used for a workbench, wood box, kitchen table, cabinet, furniture, and other items commonly found in the workshop, garage, kitchen, factory, and office. It’s very convenient for you to clean the floor by moving the workbench smoothly. Imagine if you have the castors installed on your workbench, would you save a lot of effort and greatly increase your work efficiency? Do you need the sturdy castors wheels sets 4 to move the furniture easily and smoothly? If yes, these castors wheel sets will fit the bill. All metal industrial wheels are made from super sturdier Polyurethane materials and sturdy constructed. You can glide the swivel casters effortlessly both on wooden floors and carpets from indoor to outdoor. The heavy-duty castors wheels set is designed with 360-degree free rotation. You can easily control the wheels and direction to keep the workbench in place. These swivel casters are double steel ball-bearing designed, which brings a maximum loading capacity up to 500 lbs. The swivel caster wheels roll and rotate smoothly; don’t leave marks on hardwood or other flat finished surfaces to protect your floors well. You can use these heavy duty caster pack to your workbench, wood box, kitchen table, cabinets, furniture, shelving, and others commonly found in the workshop, garage, kitchen, factory, and office from indoor to outdoor. The caster set allow you to clean the floor easily by moving the workbench smoothly. Product Specification for Industrial Caster Wheels: Quantity: casters x 4, bolts x 10, nuts x 10, screws x 10, and washers x 10. Measurement: wheels’ diameter/ 2 inches, wheels’ thickness/ 0.4 inches Materials: polyurethane and sturdy steel Color: Black Load capacity: 500 lbs Breaking system: Double ball bearing Widely used: Workbench, wood box, kitchen table, cabinets, furniture, other heavy and large items