Product Description: Advantages: 1. Each product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified, which includes Part Number, Model Number and inspection date information. 2. If you have any questions about the item, please provide us the Manufacturing Part Number for checking, your profits will be guaranteed. 3. Mainly made of iron, the middle bearing is made of bearing steel. 4. Application: steel wire rope wheel, transmission equipment, industrial roller. 5. The outer diameter is 50mm, the inner diameter is 12mm, load-bearing is 512kg. Specifications: Material: Iron & Bearing Steel Color: Titanium color Radius: R=3mm Size: 5 x 1.2 x 1.3cm / 1.97 x 0.47 x 0.51inch (OD x ID x H) Groove width: 10mm Groove depth: 7.5mm Weight: 198g Please note: In-line bearings cannot be removed. Package includes: 2x Cable Pulley