5PC Hss Hole Cutter Step Drill Bit Set With Aluminum Case
3-sided shank prevents slip in drill chuck.Different sized shanks ensure compatibility with 1/4, 3/8 and 1/2 in. chuck sizes.
Drill tip provides fast and smooth drills on steel sheets, aluminum sheets, wood board, plastic board etc. (the board must be smaller in thickness than the height of step drill bits).
Size: #1: 3/16" to 1/2"/5-13mm.#2: 1/8" to 1/2"/3-6mm.#3: 1/4" to 3/4'' /7-9mm.#4: 1/4" to 1-3/8"/7-35mm.#5: 3/16" to 7/8" 5-22mm
Includes a protective aluminum case to make the drills not easy to dull. Cobalt added reduces friction and lasts longer than those which does not contain cobalt bits.
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