Feature●? Suitable for - Shaft diameter 1/2" and hubs wheels diameter 1-3/8".●? Material - Manufactured by chrome steel sturdy and durable.●? Seal - Keeps grease in, prevents impurities from entering and extends bearing life.●? Performance - Precise size, smooth and low noise operation, multi-functional use in multiple scenes.●? Warranty - Three months warranty, free refund if there is any quality problem during the warranty period.Description