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A MULTI-PURPOSE - Stepped structure, One step drill bit is equivalent to ten twist drill bits of different specifications. Size Includes 10 steps: 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8".
APPLICATION - Ideal for steel sheets/ aluminum sheets/ copper/ plastic/ wood board and many other types of sheet metal with ease countersink.
HIGH SPEED STEEL TITANIUM COATING - Industry grade fully ground high speed steel with titanium coating reduces friction and drills with less heat,which ensures strong wear-resistance and durability.
WE ARE DIFFERENT - The spiral groove is sharper than the straight groove, which can reduce the cutting resistance, strengthen the cutting groove, and effectively block the metal splash caused by damage.135Â° split point not only promises cutting speed,but also prevents slipping when start drilling.
EFFICIENT DESIGN - Laser marking scale is clear.3/8" Tri-flatted shank fits into majority pistol drill and drill press securely without slip and shedding.Open hole, reaming hole, sink hole at one go.What are you waiting for?
Joseph Grinnell, the founding director of the Museum of Vertebrate Zoology, and zoology professor Tracy Storer conduct a landmark survey of Sierra Nevada birds, mammals, reptiles and amphibians from the Central Valley…