UPC 653334366559

• AUTOMATIC CENTER PUNCH -- Delivers an automatic, high-impact, spring-loaded strike through adjusting the cap. With the carbide tipped bit, the center punch is 10 times stronger than normal one
• 50 SIZES IN 5 -- The bit set includes five standard step drill bits that can replace 50 individual drill bits, processing 50 different kinds of diameter holes with the five pieces, without wasting time by changing drill bits. With spiral grooved design, they provide better orientation and make cutting more smoothly
• SPIRAL GROOVED DESIGN -- Povided better orientation and more smooth cutting for you. Its brass body has a deeply knurled surface for nonslip control
• HIGH SPEED STEEL -- Make it last longer than others and can automatically deburr holes while drilling to keep the drill bit clean.With titanium coating, its durability has been enhanced by reducing the friction and extending lifespan, which ensures easily cut through steel sheets aluminum sheets copper & plastic & wood board and many other types of sheet metal
• DOUBLE CUTTING BLADES & THREE-SIDED SHANK -- Double cutting blades and X-type openings design ensures a faster and smoother cutting; and 3-sided shank design prevents slipping in drilling chuck

Why choose our step drill bit ? VARIOUS FUNCTIONS, -- Spiral grooved design makes cutting faster and smoother, -- Titanium coating can enhance the durability and extend the life span by reducing the friction, -- With laser marking of measurement, you can see the sizes with half eye, -- Double cutting blades and X-type openings design ensures a faster and smoother cutting, -- High speed steel makes the step drill bit stronger and more durable, -- Center punch delivers an automatic, high-impact, spring-loaded strike through adjusting the cap, -- 3-sided shank prevents slip in drill chuck, FEATURES, -- 50 SIZES IN 5: The spiral spiral grooved includes 5 step drill bits, you can process 50 different kinds of holes with only 5 pieces, -- PROTECTIVE ALUMINUM CASE: With protective aluminum case, the drills wii not be easily to dull, -- WHAT YOU GET: 5 x Spiral Grooved Step Drill Bit Set;1 x Automatic Center Punch;1 x User's Manual;1x Aluminum Case, SPECIFICATION, 1: 7mm 35mm, 10 Step, 2: 5mm 23mm, 12 Step, 3: 4mm 13mm, 13 Step, 4:7mm 20mm, 9 Step , 5: 5mm 13mm, 6 Step, NOTE, Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, case the concentricity may cause the drill bit broken and make drill hole too large