Package Includes 4 packs of 4” heavy-duty swivel locking casters bolts x 16 and nuts x 16. There’ are 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 furniture workbench caster wheels are made from superior sturdy Polyurethane materials and is well constructed. You can glide the casters effortlessly on wooden floors and carpet as you are guided around corners and through a couple of doorways. Double Locking & Safety: The 4 packs of industrial casters are designed with a double locking mechanism. You can easily lock the wheels and direction to keep the workbench in place as the brakes hold firm. In addition, these wheels are no noise and don’t leave marks on hardwood or other flat finished surfaces to protect your floors well. Double Ball Bearings & Strong Load Capacity: All 4 swivel locking casters are double steel ball-bearing designed, which brings a maximum loading capacity of more than 1200 lbs. Wheels roll and rotate smoothly. Multiple Applications: The set of 4 swivel locking casters can be widely used for a workbench, wood box, kitchen table, cabinets, furniture, and other items commonly found in the workshop, garage, kitchen, factory, and office from indoor to outdoor. You can clean the floor easily by moving the workbench smoothly. Do you find moving the large and super heavy workbench or furniture very difficult? Do you need the heavy-duty locking wheels to move them easily and smoothly? If yes, these 4 packs of swivel locking caster wheels will fit the bill. All 4 industrial wheels are made from Polyurethane materials and well constructed. You can glide the workbench casters effortlessly both on wooden floors and carpets from indoor to outdoor. They’re designed with a double locking mechanism. You can easily lock the wheels and direction to keep the workbench in place as the brakes hold firm. These swivel locking casters are double steel ball-bearing designed, which brings a maximum loading capacity of more than 1000 lbs. Wheels roll and rotate smoothly, and don’t leave marks on hardwood or other flat finished surfaces to protect your floors well. You can use these swivel casters set of 4 to your workbench, wood box, kitchen table, cabinets, furniture, and others commonly found in the workshop, garage, kitchen, factory, and office from indoor to outdoor. It allows you to clean the floor easily by moving the workbench smoothly. Product Specification for Caster Wheels: Item name: Caster wheels, industrial casters, furniture casters, swivel wheels, polyurethane casters Quantity: Casters x 4, bolts x 16, nuts x 16 Measurement: wheels’ diameter/ 4 inches, wheels’ thickness/ 1.25 inches Materials: polyurethane and sturdy steel Color: Burgundy and bright silver Load capacity: 1500 lbs Breaking system: Double locking Double ball bearing Widely used: Workbench, wood box, kitchen table, cabinets, furniture, other heavy and large items