While most people are familiar with the twist drill bits, few are familiar with step drill bits.
If your job requires you to drill multiple holes in thin metal sheets or even hard composites or plastic sheets, step drill bits are ideal for the job. Since stepped bits basically 'cuts' its way into a hole, there's less tendency for the bit to "pull" out the workpiece like a typical twist drill bit.
As step bits can have up to 10 sizes (both in metric and imperial) in one bit, just three step bits in your tool kit would allow you to drill up to 30 different sizes. The downside to a step drill bit versus a regular twist drill bit is as you might have guessed, the shallow depth it can drill, that is, unless getting a 'stepped hole' in your workpiece is your idea all along.
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