What is a Step drill / Bamboo drill?

A step drill (bamboo shoot drill) is a drill used when you want to make holes of different sizes in a material such as metal. In addition to the conical shape, a multi-stage blade is attached. Since a general drill has a straight shape, the hole diameter is uniform, but since it has a conical shape, the hole diameter can be changed arbitrarily. It is often used by attaching it to an electric drill, etc., and can easily perform processing such as drilling and deburring. With a step drill with a spiral blade groove, chips are discharged to the outside, so holes can be drilled without clogging the inside.

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