Durability&High HardnessMade of classic carbon steel material, high hardness, offer superior cutting power and durable.Widely used suitable for DIY, home and general building or engineering using, etc. Three Pointed DesignQuickly and accurately drill a smooth hole. Better in centering and no skid.Five-edged chamfer design will fast discharge chips from the hole on both sides automatically.It can effectively prevent the accumulation of debris retention, improve the drilling efficiency. Different SizesOur Countersink drill bit sets include 6 kinds of sizes: 2.8 x 10mm, 3 x 8mm, 3.2 x 8mm, 3.5 x 8mm, 4 x 8mm, very suitable for using to multi size wood hole drilling. One tool for multi uses, improve your working efficiency. Removable and AdjustableThis countersink drill set is contains 6pcs hex key wrench, use the hex key to adjust counter sleeve depth and drilling depth for screws of various lengths. Complete specifications can satisfy all you demand. Suitable for WoodworkingCompatible with drilling machines with chuck, for drilling in wood or wood flooring. It is recommended to use the center punch to position before drilling, keep the drill bit Vertical to prevent the drill from bending or breaking.Each drill bit comes with a plastic box with a marked size to facilitate your identification and storage. BQKKWIN Professional Countersink Drill Bits for wood Our Countersink Drill Bits for Wood Screw Cutter is strictly produced with high-quality materials, which is more accurate in size than other Countersink Drill Bits for Wood. Our Countersink Drill Bits is your good helper in the wood industry. Wood Hole Drill BitHole Drill BitTimber Wood Working Countersink Drill Bit Suitable for all kinds of wood drilling operations Compatible with drilling machines with chuck, for drilling in wood or wood flooring. It is recommended to use the center punch to position before drilling, keep the drill bit Vertical to prevent the drill from bending or breaking. Clever design Improve your work efficiency. More suitable for woodworking drilling work. Adjustable counter sleeve depth Adjustable counter sleeve depth with Allen wrench. Wood Working Countersink Drill Bit Made of classic carbon steel material Made of classic carbon steel material, high hardness, offer superior cutting power and durable.Widely used suitable for DIY, home and general building or engineering using, etc. Wood Working Countersink Drill Bit