3pcs HSS Round Shank Titanium Coated Quick Change Step Drill Bits 3/16-1/2 1/8-1/2 1/4-3/4 Inch

Description 3pcs HSS Round Shank Step Drills Titanium Coated Quick ChangeStep Drill Bits3 16 1 2 1 8 1 2 1 4 3 4 InchIntroduction Step drill also known as multi purpose drill with straight flute spiral groove single slot White diamonds titanium drill colorful diamond black diamond Handle a round handle triangular handle hex shank SDS shank It has the functions of deburring chamfering and elliptic hole enlargement Don t need to use center punch it is more durable and not easily broken compared with twist drill Specification Material High Speed Steel 4241 Used for the hardness of the material which is below 25° like iron borad steel board PVC board Insulation board etc Surface Titanium PlatedShank RoundScop thin iron plate aluminum insulation panels PVC panels 4mm thickness within the timber SizeDrilling Range Φ inch HoleFlute Height mm Height of Shank MM Shank Diameter Φ mm 3 16 1 23 16 1 4 5 16 3 8 7 16 1 26352561 8 1 21 8 3 32 5 32 7 32 1 4 9 32 5 16 11 32 3 8 13 32 7 16 15 32 1 213522561 4 3 41 4 5 16 3 8 7 16 1 2 9 16 5 8 11 16 3 49502510Features High speed steel material more durable Titanium coated to reduce friction and run coolerNo need for a pilot hole can automatically deburr holes as you drill Special step stucture can drill different size holes 1 step drill can be used as 1 box of drill bit Working with water cooling can effectively extend the service life of bit drilling speed 250 400 recommended Widely used to cut holes in a variety of mat