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Much like cone drill bits, these are step drill bits which are used for enlarging existing holes. However these have marked and visible grooves so you are able to see to which size is required. These are all made of different materials for different jobs. Some are for use on Metals, others are for softer and thinner materials.
If you know the part number of the step drill bits you need please enter it into the search bar on the left hand side. Otherwise you can always find it manually below If you are struggling to find what you need please contact us and we would be more than happy to help