Countersink Drill Bit Set, 12PCS 2-Flute Adjustable Bits for Wood | Titanium-Coated HSS Bits, Sizes #4, #6, #8, #10, #12, Magnetic Extension Bit Holder, 1/4" Hex Shank, Storage Case

Unique Two-Flute Design: Featuring a dual-edge cutting design, these countersink drill bits reduce chatter and ensure smooth, precise finishes. Compared to single-blade bits, they provide faster cutting, suitable for larger or deeper countersinks.
Upgraded 12-Piece Set: This countersink drill bit set contains 5 pieces of countersink bits (#4, #6, #8, #10, #12), 5 pieces of replaceable drill bits, 1 piece of 60mm magnetic extension bit holder, 1 piece of Allen wrench, and a storage case.
Strong and Durable: Made from premium titanium-coated high-speed steel, the countersink bits are excellent for use on both softwood and hardwood. The upgraded chamfer blade with a stepped design reduces cutting resistance and enhances durability.
Efficient and Clean Drilling: Designed with sharp blades and an 82-degree countersink angle, these bits create fast, clean pilot holes for a secure screw fit. All-in-one drilling, countersinking, and counterboring improve efficiency.
Versatile Application: Fitted with a 1/4" hex shank, these countersink drill bits work with a wide range of tools, including impact drills, hand drills, bench drills, and electric drills. Adjustable depth settings suit various wood thicknesses, though prolonged use on hardwood is not advised