MultifunctionWhether you use our connecting screws for your carpentry work or repairing and assembling your furniture at home, this accessory serves its purpose. Size Details Applicable opening: 5/16 inch (8mm), external thread size (screw): M6 x 20mm, internal thread size (top): M6 x 15mm. Easy to UseFirst, open a hole 0.5mm larger than the diameter of the nut shank, put screws and nuts on both sides of the object to be locked, then use a hex wrench or an available tool to lock it to complete the fixing. The binding screw column uses high-quality stainless steel, which is more rigid and durable than other metal materials , waterproof, rust-proof and wear-resistant, 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 cast, it is stable in use and does not slip. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.