Description: The whole kit includes 9 types of screws and 2 types guitar strap buttons and 2 sorts of springs totally which totally sums up to 258 pieces with a storage box for storin, convenient to carry and keep. The kit assortment box basically makes it easy for you to deal with guitar repairment or it is also perfect for a DIY project. There are 2 kinds of guitar strap buttons which are easy to install, you just need attach it to your strap, and screw securely and tightly into locking position. The guitar screw kit can help to complete guitar repairs and adjustments,suitable for string instruments players.It can used to maintain the instrument in a well-operated playing condition. The matching and assembly of various screws can be applied to the installation requirements of each part of the guitar. Specification: Material: Metal Size: Screws: L12mm/0.5inch, 3mm/0.1inch L28mm/1.1 inch ,4mm/0.2 inch L34.5mm/1.4 inch ,4mm/0.2 inch L45mm/1.8 inch ,5mm/0.2inch L22mm/0.9inch ,3mm/0.1inch L7.2mm/2.8inch ,2.9 mm/1.1inch L8mm/0.3inch ,2.3mm/0.1inch L21mm/0.8inch ,3mm/0.1inch L29mm/1.1inch ,3mm/0.1inch(spring L26.5mm 4.5mm) L21mm/0.8inch ,3mm/0.1inch (spring L14mm 5mm) L22mm/0.9inch , 3mm/0.1inch Strap buckle: L9.63mm/0.4inch,14.8mm/0.6inch gasket 10mm/0.4inch thickness 1.2mm/0.05inch, L9mm/0.4inch 14mm/0.6inch spacer 10mm/0.4inch ,thick 1.2mm/0.05inch. Package Includes: 1 Piece Guitar Screws Kit