Features: 1. Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information.2. Mainly made of iron, the middile bearing is made of bearing steel.3. Application: steel wire rope wheel, transmission equipment, industrial pulley.4. Outer diameter is 50mm, inner diameter is 12mm, load bearing is 512kg.Specifications:Material: Iron & Bearing SteelColor: Titanium ColorRadian: R=3mmSize:5 x 1.2 x 1.3cm/1.97 x 0.47 x 0.51 inch(OD x ID x H)Groove Width: 10mmGroove Depth: 7.5mmWeight:396gPackage include:4x Cable Pulley