50 SIZES IN 5+1: The step bit set includes five standard step drill bits that can replace 50 individual drill bits, let you process 50 different kinds of diameter holes with the five pieces, Extra center punch marks workpiece with a dimple, creating a starting point that prevents screws and drills from wandering
HSS & TITANIUM COATING: High speed steel makes it last longer than others, titanium coating ensures easily cut through steel sheets aluminum sheets copper & plastic & wood board and many other types of sheet metal with ease, and it can automatically deburr holes while drilling to keep the drill bit clean
AUTOMATIC CENTER PUNCH & PROTECTIVE ALUMINUM CASE: Delivers an automatic, high-impact, spring-loaded strike through adjusting the cap, The carbide tipped bit makes the center punch 10 times stronger than normal one, Protective aluminum case makes the drills not easy to dull
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 slip in drill chuck, Provided with small pressure and the sets can cut through the wood, sheet metal, steel and other surfaces
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