What is this?The string winder head tool can be to shear the string, or guitar string winder and can be used to pull out the frets and pins.What will I get?Color: BlackMaterial: Plastic, MetalOverall Length: 65mm/2.56"Size of black part: 40mmx 25mm/1.57" x 0.98"(L*Max.W)Length of shank: 24mm/0.94"In the package of: 1pcs x String Winder Head ToolAre there any advantages of the product?String spreaders fit behind the guitar neck, to capture the loosened strings and give you room for filing, cleaning, polishing, or light repairs Everything you need to keep your guitar frets well set up, replace, and clean.How to use it?String Spreaders: Capture the loosened strings and give you room for filing, cleaning, polishing, or light repairs. String Cutter: Shear the string, and pull out the frets and pins.What should I notice?Manual measurement, please allow a slight dimensional error of the item.