Upgrade your workbench, cart, or equipment with this set of 4 heavy - duty 4 in. caster wheels. Each wheel can support up to 300 lbs., offering a total load capacity of 1200 lbs. The wheels are made of high - quality Polypropylene (PP), which is wear - resistant, has low rolling resistance, and can withstand oil, grease, and water. The dual locking system ensures safety by locking both the wheel rotation and the swivel plate assembly. With 360° rotation, you can easily change directions, whether in a tight shop corner or at home. The package includes 16 sets of hex bolts, nuts, and washers for quick installation. These casters are perfect for heavy tool chests, welding tables, and equipment racks, bringing convenience to your workshop and daily life. Color: Blacks.