Features:100% brand new and high qualityImproves performance for your guitars,it stress on your strings which allows the guitar to stay in tune longerThis also prevents wear and tear on the strings which results in longer string lifeBase is 6mm wide x 11.5mm length;Roller width is 10mm;Roller diameter is 5mm; String Spread(center to center) is 7 mmMetal made, come with mounting screws, ready for use.Package Included: 2x Guitar String TreesPackage Includes:2 x String retainers2 x Mounting screwsSpecifications:Color:Silver/Black/GoldCompatible with electric guitar and bass.Base Size (L x W): Approx. 0.43 x 0.23 inch / 11 x 6mmTotal Height: Approx. 0.47 inch / 12mm (including the roller)Roller Size (L x D): Approx. 0.4 x 0.2 inch / 10 x 5mmString Spread (Center to Center): Approx. 0.27 inch / 7mmRetainer Material: Zinc alloyScrews Material: Steelnote:Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you