Check the listing for details. 4" Casters, 3/8" Bolt, Loading Capacity 600 lbs, 4 Packs of 4 Casters. Condition: New. Listed at 74.07 USD. These 4" Casters are ideal for use in your home, office, business, restaurant, medical facility, residential facility, hotel, motel or other environments. They have a metal construction for a level of durability that will withstand daily use and deliver you a long lifespan. These heavy-duty casters are compatible with wire shelving poles that have an insert bolt size of 3/8". Simply screw them in to install. Each set of metal casters come with two locking wheels, which helps keep your shelving unit in place. They have a maximum load capacity of 600 lbs, making them suitable for placing under large units.4" Casters, 3/8" Bolt, Black, 4 Packs (4 Casters in 1 Pack):Wheel diameter 4"4" casters with 2 locking wheelsEasy to installFits wire shelving poles with insert bolt size of 3/8"Total loading capacity: 600 lbsHeavy-duty casters are made from metal for a high-level of durability and a long lifespanIdeal for use in homes, offices, restaurants, medical facilities, hotels, motels and more