5PCS Titanium Spiral Grooved Step Drill Bit Set with Automatic Center Punch with Aluminum Case

Material High Speed Steel Finish Type Titanium Shank Type Triangle Brand JINDAN Technology Tool Flute Type Spiral About this item Universal Compatibility ----- The step drill bits help you to drill holes with different diameters simultaneously, compatible with aluminum, copper, steel sheets and plastic and wood board that is less than 3mm/0.12 in. in thickness. 50 Sizes In 5 ----- Our bits set includes five standard step drill bits that are capable to drill 50 holes with different diameters, saving you time and efforts; to make your holes more accurate, please do use a center punch to locate before drilling. Durable Titanium Coated Bits W/Spiral Grooves ----- The spiral grooved drill cut more smoothly than straight grooved ones, the drill bit is sharp and can easily drill perfect holes in the metal sheet while the Titanium coating improves durability hence lengthening the service life. Less Splashing & Saves Your Money ----- X-type opening design can facilita