I've used them for drilling aluminum and mild steel. They work great. With these step drills you get rounder holes than with a conventional drill. They're also great for deburring the back of anything you're drilling.
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24 Review
Impact screwdriver Makita TD0101F, 230 W
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27 Review
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45 Review
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16 Review
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πͺ DEWALT DW3984C Portable Blade Set of 3-Pack