Step Drill Bit Set Automatic Center Punch 5pcs HSS Cobalt Titanium Step Drill Bit Set Multiple Hole 50 Sizes High Speed Step Drill Bit Set with Aluminum Case

Powerextra is specialized in manufacturing power tool batteries and hand-tools. Our products are made with the highest quality materials and focus on providing high quality power products. Product made by HSS material+ titanium coating HSS( High speed steel ) is an alloy steel that composed of several kinds of carbide. It can withstand higher temperatures without losing its hardness and toughness, this property allows HSS to cut faster than high carbon steel. Titanium coating can protect the drills in the high speed cutting process, prolong the product life. X-shape cutting blades design enables a faster and smoother cutting. Automatic Center Punch mark the hole locations and starts drill bits and screws, preventing wandering. Exquisite Aluminum Case protects the drill bits not easy to dull and take the drills to anywhere more easily. Size: 3/16''-7/8''Steps(3/16'',1/4'',5/16'',3/8'',7/16'',1/2'',9/16'',5/8'',11/16'',3/4'',13/16'',7/8'') 1/8''-1/2''Steps(1/8'',5/32'',3/16'',7/32'',1/4'',9/32'',5/16'',11/32'',3/8'',13/32'',7/16'',15/32'',1/2'') 1/4''-1-3/8''Steps(1/4'',3/8'',1/2'',5/8'',3/4'',7/8'',1'',1-1/8'',1-1/4'',1-3/8'') 1/4''-3/4''Steps(1/4'',5/16'',3/8'',7/16'',1/2'',9/16'',5/8'',11/16'',3/4'') 3/16''-1/2'' Steps (3/16'',1/4'',5/16'',3/8'',7/16'',1/2'') Note: It's recommended that adding water to cool the drill bit before use. It suits for most steel sheets, aluminum sheets, copper / plastic / wood board, did not work for porcelain, ceramic, cultured marble, natural stone or concrete of any sort. Package included: 5 x Step Drill Bits 1 x Automatic Center Punch 1 x Aluminum Case