Using high-quality rubber materials, it has good performances such as wear resistance, high load capacity, shock absorption and cushioning. The flat top details and enhanced riveting technology make the flat top stronger and . Super qulity. The top is perforated and fixed, and the top of the caster adopts scientific measurement . The four-hole positioning allows your rollers to be firmly fixed on the object, load-bearing, 360rotatable, omni-directional rotation, reducing environmental noise, quieter, and more reliable in use Both the bottom plate and the shell adopt one-time molding technology, which has the characteristics of low wear, labor saving, quiet, , super wear-resistant, and not easy to damage. Uses: widely used in furniture, toy cars, swivel chairs Product Size: 2 inches: wheel diameter (mm): 50 Wheel width (mm): 18 Bearing capacity (kg): 25 Installation height (mm): 65 Floor size (mm): 46 x 39 Installation hole distance (mm): 36 x 28 Screw size (mm): M10 x 25 Material:Rubber + stainless steel colour:Silver + gray Package Contents: 4 x flat bottom brake Only the above package content, other products are not included. Note: Light 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.