#6,#8,#10(X2),#12(X2),#16(X2) Countersink Counterbore Drill Bit, 1/4"Hex Shank 3in1 Countersink Drill Bit Set ? The Ultimate Woodworking Tools for Precision Screw Setting? Designed to drill countersink and counterbore in one simple step, this set is the ultimate solution for achieving flawless flush screws. Equipped with 5 packs of countersink drill bits in various sizes #6, #8, #10(x2), #12(x2), #16(x2),this assortment covers all your needs for centered screw holes in both soft and hard woods. Key features: 1. Meet All Your Needs: With a range of sizes, our countersink drill bits are perfect for achieving perfectly centered screw holes in both soft and hardwoods. Say goodbye to guesswork and uneven screw settings. 2. Easy To Use: Our 3 sharp-edged 82-degree chamfer design countersink bits are built with 1/4" hex shanks featuring a groove for quick size changes without any bit slipping. This makes them compatible with most electric drills and tools, ensuring convenience and efficiency. 3. Drilling Depth Adjustable: Achieve precise depth control with the adjustable working length of the pilot drill bit. No more worrying about drilling too deep or too shallow. Additionally, we provide hex wrenches for changing or tightening the pilot drill bits. 4. Compatible with More Materials: Our bits are made of high-quality M2steel, while the countersink bits are crafted from high carbon steel. This combination allows you to drill into a variety of materials,including hard wood, soft wood, plywood, and even plastic. For soft wood, were commend using a drill bit one size smaller to ensure optimal results. Versatile: 3-in-1 countersink drill bit set with 8 pieces of M2 bits, in size of 3/32", 7/64", 1/8"(x2), 9/64"(x2), and 3/16"(x2),with 3 Allen Wrench". Professional Wood Drill Bits: Countersink drill bit set suitable for drilling holes in both hard and soft wood, perfect for #6, #8, #10, #12, #16 screws. Easy To Use?3 sharp edged 82-degree chamfer design Countersink bits built with 1/4" Hex Shanks with groove for quick size changes without bit slipping, compatible with most electric drills and tools. Drilling Depth Adjustable? Working length of the pilot drill bit is adjustable for precise depth control; hex wrenches included for changing or tightening the pilot drill bits. Compatible with More Materials ? Pilot bits are made of high quality M2 steel, countersink bits make of high carbon steel, able to drill in hard wood, soft wood, plywood, plastic; Please use a drill bit one size smaller in soft wood.