【Multifunction】 Whether you use our connecting screws for your woodwork or for repairing and assembling your furniture at home, this accessory will serve its purpose. 【Size Specifications】 Applicable opening: 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 the screws and nuts on both sides of the object to be locked, and then use an Allen wrench or any available tool to lock it and complete the fastening. 【High Quality】 The connecting screw column is made of high-quality stainless steel, which is stiffer and more durable than other metal materials, waterproof, rust-proof, and wear-resistant, and can be used for many years without worry. 【Scope of application】It is very suitable for connecting wooden boards, furniture shelves, cabinets, etc. The thread is deeply fused, stable in use and does not slip.