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.Gear ratio: 1:184.Suitable for classical guitar string alignment replacement, as well as DIY replacement according to personal preferences.5.The high-quality gear knob with a gear ratio of 1:18 makes it easier to adjust, rotates smoothly, fixes the strings for a long time, and prevents string slippage.6.Triple design, open knob, accurate tuning, no out-of-tune, firm installation, no loosening.7.The knob of the large black oval handle with gold-plated pattern is elegant and beautiful, which can decorate your guitar well and make your guitar look more beautiful and fashionable.Specifications:Material: A3 Steel Plate & Iron Strings & Copper Gears & PlasticColor: Black & GoldBrand name: BQLZRSize: 119x18x45.9mm/4.69 inchx0.71 inchx1.81 inch (LxWxH)Plastic Column Shaft: 9.5mm/0.37 inch (Dia)Weight: 110 gPackage include:1 x Guitar Tuners Machine Heads4 x Screws1 x Screwdriver