Fangrui Product Details [high -quality Tungsten Carbide Blade] Made Of High -hard Metal, With High Strength And High Hardness, Durability, Hard Alloy Blade, Rust -proof And Anticorrosive Performance. Hard Alloy Knives Have Higher Cutting Efficiency And Hardness Than Ordinary High -speed Steel Tools. It Can Accompany You For A Long Time. [suitable For Size] The Drill Bit Uses 0-400 Rpm, Which Is Suitable For Round Blank Materials, Rods, Screws, Screws, Etc. From 1/8 (3mm) To 3/4inch(20mm). The Larger The Size Of The Lengthel, The Greater The Pressure, The Greater The Scope Of The Application Of Most Bolts. [six -ends Quickly Release Design] The Hexagonal Handle Has A Rapid Release Design, Suitable For Most Drills. Starting From The Lowest Speed, Gently Apply Pressure To Remove The Burrs And Increase The Speed As Needed. [no Defective Edge] Our Exterior Corners Of The Burr Can Quickly Repair Bolts And Tighten The Nuts To Rough Materials (such As Soft Steel, Copper, Brass, Wood, Glass Fiber And Hard Plastic). The Edge Is Transform