Multifunctional drilling set 6/8/10/12mm, the size has been from very small to very large.The size of the tenon depends on the size of the hole and the type of processing material.You can choose according to the tool.Hexagonal drill bit is widely used and High -intensity oblique -eccentric drilling set can be used to process threads of materials, including metal, wood, plastics and composite materials.The polishing is and burrs, making the threading simple The blade is made of high -speed steel. After hardening, it is fully grinding to make the tenon more .High -quality materials are to and , .Under natural conditions, our drill is not easy to corrode or deformed, so you can use it with confidence High -strength eccentric twist drill bit is designed for handheld drills, so it can also be used for threads.Economic and practical.The tenon is easy to use, and the blade design can be cut quickly and easily.It can be used for HRC Less than 30 various metal parts Colour: Material:steel Package Contents: 1 set x high-strength eccentric twist drill bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.