Rotate 360 degrees. Smooth and Silent and Sturdy. The total locking brake locks both the wheel and the swivel simultaneously  Capacity 55LB per wheel, Total 220LB. Bearing: Double ball bearings( 608zz bearings)  Plate Size: 2.75inx 2in. Mounting hole dimensions: 8.5 x 11.5 mm /0.33in x 0.45in. Caster axle bolt size: 6mm(diameter) x 45mm(length) /0.24in x 1.77in  2in Diameter PU Wheel. Polyurethane (PU) wheels offer the elasticity of rubber wheels combined with the toughness and durability of metal wheels. Safe for all floor types  Commonly used with small removable plate. Perfect casters for small equipment and small space furniture including ottoman, coffee table, plant stands, bookshelves, shoe bins, toy bins, shopping carts, workbench, underbed storage...  colour: black  Material: Metal + PU                  Package Contents:                  2pcs * with brake casters  2pcs * without brake casters  Only the above package content, other products are not included.                  Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.