1, WHAT YOU GET ---- In this kit, You will get 25Pcs Carbon Steel Black Hex Drive Socket Cap Bolts Barrel Nuts Kit with 1Pcs Allen Wrench, Including M6x50mm; 12Pcs and M6x17 Nuts: 12Pcs. We now have a variety of sizes to choose from, you can choose whatever you need, which can fully meet your daily needs. 2, PRODUCT SIZE ---- Applicable Hole Dia5/16"(8mm); Male Thread Size(Screw): M6x16mm; M6x20mm; M6x25mm; M6x30mm; M6x35mm; M6x40mm; M6x45mm; M6x50mm; M6x55mm; M6x60mm; M6x65mm; M6x70mm; M6x75mm; M6x80mm and M6x17(D*L); Female Thread Size(Top): M6 x 17mm(D*L). Threaded post lets you open and re-attach piece where needed. 3, HIGH QUALITY ---- Every barrel nut and bolt is Precision mechanical thread, made of high-quality carbon steel material, black powder coating, anti-rust. Those have the performance of high hardness and good toughness, The screw thread is clear and not easy to loose. which make the kit more sturdy and durable. 4, WIDE APPLICATION ---- It is ideal for thin albums, decorative bags, leather belts, sandals, boots, leather bags, etc.Fit for all kinds of art and leather crafts and DIY clothing production. Also Used for: bed, table, chair, crib, or workbench, boards, cabinets, cupboards, other furniture. 5, EASY TO INSTALL ---- Threaded post lets you open and re-attach piece where needed. Make a hole larger than 0.5mm than the diameter of the nut rod, put screws and nuts on both sides of the locked object, and select the appropriate tool to lock it. Easily applied with standard screwdriver.