HSS Titanium-Coated Spiral Groove Step Drill 4-Piece Set with Automatic Center Punch 1/4 Hexagon Shank Drill Bit

Product description Package Included: 3 x Step Drill Bit Set; 1 x Automatic Center Punch; 1 x Storage Bag Instructions: When use the drills please always wear protective goggles mask and gloves. Do not touch it with your hand as the drill will Produce When using heat there will be the risk of burning. It is recommended to oil the bit before every use & Please do not set too high drilling speed to Avoid damages to cutting edge Please drill a smaller hole to make smoother drilling. The material is qui you want to drill shoulds not Exceed 0.12 in. in thickness. Please pay careful que la product need to Log be cooled by water injection When You use the product metal plate.The drill step drill is easy To Become soft Because of high temperature. If you do not cool the drill it will be scrapped quickly. Our drills are HSS High-speed steel 4241 you d better not use it to drill the material That Is Sami have our product or drill the material que la hardness is Higher Than our product.