Step drill bits tested: DeWalt, Makita, Milwaukee Shockwave, Temo, Bosch Turbo, Lenox VB8, Hercules, Diablo, Irwin, Klein, Harbor Freight Drillmaster, Heiko, and Bauer. Step drill bits tested for speed and durability using mild and medium hardness steel. In the ultimate test for quality and brawn, the top 7 brands of unibits tested on AR400 armor plating. Speed and durability compared to a DeWalt and Bosch drill bit (twist drill).

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