Titanium Coated Drill Bit Step drill bits set are made of classic high-speed steel with titanium coating,anti-oxidation, no rust, wear-resistant and long life. The best Father's Day gift for father.Meet Your DemandYou can the high speed steel drill bits process different kinds of diameter holes, plastic, aluminum, wood board, copper, stainless steel and many other types of sheet metal.which greatly saves you a lot of trouble.Easy To CarryYou will get a 3 sizes of step drill bit + 3 sizes of twist drill bits,and one tool box,not take up space, Can be stored in your tool box and used anytime, easy to transport and storage.Widely UseTitanium coating ensures easily cut through steel sheets, aluminum sheets, copper & plastic & wood board, and many other types of sheet metal ease, Including tile, concrete, tile, brick, wood, plastic, glass, masonry, etc.6 Pcs Drill Bit Set5-Step Drill Bit from 4mm to 12mm (1/8-1/2),9-Step Drill Bit from 4mm to 20mm (1/8-13/16),15-Step Drill Bit from 4mm to 32mm (1/8-1.25),3mm (3/32) Twist Drill Bit,6mm (1/4)Twist Drill Bit,8mm (5/16) Twist Drill Bit.