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.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Can improves performance for your electric guitar.4.Ideal guitar parts for replace your old or damaged string retainers.5.Easy to use,come with mounting screws, ready for use.Specifications:Material:CopperColor:SilverSize: approx 1.3x1.1x0.4cm/0.51x0.43x0.15 inch (LxWxT)Hole Diameter: approx 2.55mm/0.1 inchScrew Length: approx 8.35mm/0.33 inchWeight:80gPackage include:40 x Electric Guitar Roller String Trees40 x Screws Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia