Fangrui Product Details 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 Safer High -intensity Oblique Head -eccentric Drilling Set Can Be Used To Process Threads Of Various Materials, Including Metal, Wood, Plastics And Composite Materials.the Polishing Surface Is Sharp 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 Sharp.high -quality Materials Are Resistant To Corrosion And Corrosion, Durable.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 T