Item Type: Casters_x000D_ Material: Stainless Steel + Polyurethane (PU)_x000D_ Load Bearing: 20kg / 44.1lb(approx.)_x000D_ Bottom Plate Size: Approx. 42 x 42mm / 1.7 x 1.7in_x000D_ Installation Height: Approx. 50mm / 1.97in_x000D_ Quantity: 4pcs _x000D_ Usage: Industrial Casters 1Integrated structure of the base with strong load bearing capacity, simple and practical accessory for replacement use. 2Easy to use, can be directly installed on the design part of the main engine with bolts, convenient and simple. 3PU material of the casters are wear?resistant, silent and do not hurt the ground, will not leaving any scratch on hard floor surfaces. 4Offering exceptionally easy rolling ability and a strong resistance to deformation, roll smoothly and silently. 5Helping you save effort to move your heavy projects. 20kg / 44.1lb(approx.) of the load bearing capacity.4 x Casters