1. WHAT YOU GET: This kit includes 25 pieces of carbon steel black hex drive socket cap bolts and barrel nuts, along with 1 piece of Allen wrench. Includes M6x50mm (12 pieces) and M6x17mm nuts (12 pieces). Available in multiple sizes to meet various daily needs. 2. PRODUCT SIZE: Applicable hole diameter: 5/16" (8mm). Male thread size (screw): M6x16mm, M6x20mm, M6x25mm, M6x30mm, M6x35mm, M6x40mm, M6x45mm, M6x50mm, M6x55mm, M6x60mm, M6x65mm, M6x70mm, M6x75mm, M6x80mm, and M6x17mm (D*L). Female thread size (nut): M6 x 17mm (D*L). Threaded post design allows for easy disassembly and reattachment as needed. 3. HIGH QUALITY: Each barrel nut and bolt features precision mechanical threading, constructed from high-quality carbon steel with a black powder coating for rust resistance. Designed with high hardness and good toughness. Clear thread design helps prevent loosening, ensuring durability and strength. 4. WIDE APPLICATION: Suitable for use with thin panels, decorative cases, leather belts, sandals, boots, and leather bags. Ideal for various art and leather crafts, DIY clothing projects, as well as furniture applications including beds, tables, chairs, cribs, workbenches, boards, cabinets, cupboards, and other household furniture. 5. EASY TO INSTALL: Threaded post allows for flexible assembly and disassembly. Drill a hole slightly larger than 0.5mm in diameter than the nut rod, insert the screw and nut on both sides of the material, and secure using an appropriate tool. Compatible with standard screwdrivers for easy installation.