Features: new and Improves performance for your guitars,it stress on your strings which allows the guitar to stay in tune longer This also prevents wear and tear on the strings which results in longer string life Base is 6mm wide x 11.5mm length;Roller width is 10mm;Roller diameter is 5mm; String Spread(center to center) is 7 mm Metal made, come with mounting screws, ready for use. Package Included: 2x Guitar String Trees Specifications: Color:Silver/Black/Gold for electric guitar and . Base Size (L x for W): Approx. 0.43 x 0.23 inch / 11 x 6mm Total Height: Approx. 0.47 inch / 12mm (including the roller) Roller Size (L x D): Approx. 0.4 x 0.2 inch / 10 x 5mm String Spread (Center to Center): Approx. 0.27 inch / 7mm Retainer Material: Zinc alloy Screws Material: Steel Note: 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! Package includes: 2 x String retainers 2 x Mounting screws