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Material: Metal Finish Type: Titanium Tool Flute Type: Spiral-The drill bits set includes 5 common sizes for versatility, it can fit the majority of brands currently on the market. Different sized shanks ensure compatibility with 1/4, 3/8, and 1/2 inch chuck sizes.-Non-walking drill tip provides fast and smooth drills on steel sheets, aluminum sheets, wood board, plastic board, etc. With these step drill bits, you can process different kinds of diameter holes, which greatly saves you a lot of time.-All the bits come in a well-organized case for easy transport and storage.