【Multi-function】Whether you use our connecting screws for your carpentry work or the repair and assembly of your furniture at home, this accessory fulfills its function. 【Size details】 Applicable aperture: 5/16 inch (8 mm), external thread size (screw): M6 x 20 mm, internal thread size (top): M6 x 15 mm. 【Easy to use】 First, open a hole 0.5 mm larger than the diameter of the nut rod, place screws and nuts on both sides of the object to be locked, and then use a hexagonal wrench or an available tool to lock it to complete the fixation. 【High Quality】 The binding screw column uses high-quality stainless steel, which is more rigid and durable than other metal materials, waterproof, rust-proof and resistant to wear, and can be used with confidence for many years. 【Scope of application】 It is very suitable for connecting wooden boards, furniture shelves, cabinets, etc. The thread is deep sunk, it is stable in use and does not slip. Note: The data are all measured manually, please allow