Feature●✔ Fits for - Shaft diameter 3/4" 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