Heavy Duty Casters with Precision Ball Double Bearings for smooth swiveling and rolling. 3-inch wheels made from solid polyurethane, each with a weight capacity of 250Lbs. Black caster bracket with plated finish, resistant to rust, ensuring durability. Non-marking design protects floors and enables quiet rolling operation. Suitable for furniture, shelves, workbenches, material handling carts, stock carts, food processing equipment, bakery racks, conveyors, laboratory equipment, retail displays, store fixtures, and more. Flat bottom with double brakes for strong safety; total lock brake secures both wheel and swivel simultaneously, preventing movement. Brake operated easily with foot action. Easy installation with two types of mounting screws kits: 16 x Pointed Screws (with 16 Washers), 16 x Flat Head Screws (with 16 Nuts), suitable for wood, steel, plastic surfaces. Package includes 4 x 3-inch casters, matching screws, and iron washers. Color as shown.