Advantages: 1. Every product has a unique Manufacturing Part Number label on the inner package that verifies qualification, including Part Number, Model Number, and inspection date information. 2. If you have any questions about the item, please provide the Manufacturing Part Number for verification. 3. Mainly made of iron, the middle bearing is constructed from bearing steel. 4. Suitable for applications such as steel wire rope wheels, transmission equipment, and industrial pulleys. 5. Outer diameter is 50mm, inner diameter is 12mm, with a load capacity of 512kg. Attention: In-line bearings are not removable. Specifications: Material: Iron + Bearing Steel Color: Titanium Radian: R=3mm Size: 5 x 1.2 x 1.3cm / 1.97 x 0.47 x 0.51 inch (OD x ID x H) Groove Width: 10mm Groove Depth: 7.5mm Weight: 99g Package Includes: 1 x Cable Pulley