The tip is sharply pointed, so you can use this tool to drill holes without a pilot hole, or with only a very small pilot hole, and then enlarge the hole to your desired size.\\nIt's especially ideal for enlarging holes in relatively thin plastic parts like canopies or cowlings. \\nThe blade features diameter markings up to 12mm. By using these as a guide to create a rough hole, then fine-tuning it to fit perfectly on the actual part, you can achieve holes of the exact size you need for extensio