Fangrui Product Details [premium Aluminum Alloy Material] This Limit Countersink Drill Bit Set Is Made Of Premium Aluminum Alloy On The Main Body, Which Is Beautiful, With High Hardness And Long Service Life [quick Change] The Drill Head Can Be Replaced According To Needs, Easy To Use, And Quick . Two-way Quick Release. It Can Be Used For Countersinking And Screwing, Double-purpose Operating, Convenient And Simple, And Can Be Applied To A Variety Of Places [what You Get] The Package Includes 1 Limited Countersink Drill, 4 Countersink Drill Bits, 1 Hexagonal Wrench And 1 Plastic Ring. This Kit Can Meet The Drilling Needs Of Various Common Sizes Of 3/16x1/2inch, 1/8x3/8inch, 11/64x1/2inch, 5/32x3/8inch And 9/64x3/8inch [easy To Adjust] It Is Adjustable With Scale. The Hexagon Socket Screw Fixed Slot Can Be Adjusted According To Needs, Engraving, Clear And Not Easy To Wear, And The Countersink Is More Accurate [widely Uses] This Wood Countersink Drill Bit Set Is Suitable For Bench Drills, Hand Drills And Conventional El