Fangrui Product Details Depth Adjustable For Precision: This Countersink Bit Set Allows For Precise Drilling With Adjustable Pilot Drill And Counterbore Depths. Easily Set The Depth Stop Using The Included Wrench, While The Plastic Free-spinning Collar Minimizes Surface Marring, Ensuring A Clean Finish. Comprehensive 5-piece Set: Equipped With Five High-speed Steel (hss) M2 Tapered Bits In Sizes 1/8 Inch, 9/64 Inch, 5/32 Inch, 3/8 Inch, And 1/2 Inch 82 Counterbores, This Set Is For Woodworking. The 1/4 Inch Hex Shank Ensures A Secure Grip And Universal Compatibility With Most Drills. Sharp And Durable Design: Our M2 Hss Countersink Bit Features A Spiral Chip Flute For Efficient Cutting. Versatile Application: Suitable For A Variety Of Materials Including Natural Woods, Chipboard, Plywood, Mdf, Decking, Drywall, And Plastics. For Optimal Results, Operate The Countersink At Slow Speeds, Around 200 Rpm, To Maintain Smooth Edges And Prevent Damage. Colour:as Shown Material:aluminum Alloy The Actual Product May Have Slight