Heavy Duty Double Bearing Series Casters, The wheels are 4 "~ 8" with a bearing range of 130 ~ 505kg, which is widely suitable for various heavy-duty working conditions. The casters are installed in top plate type. The wheels are made of polyurethane wheels, iron core polyurethane wheels, nylon wheels, high elasticity rubber wheels and artificial rubber wheels. The surface of the wheel frame is covered with blue zinc plating and electrophoretic black plating, which can be divided into universal wheels, directional wheels and universal belt brake wheels according to the structure.