https://euntimcocdn.blob.core.windows.net/web-cat-nav-images/power-and-hand-tool-accessories/cone-cutter-cat-nav.jpg

Cone Cutter

For drilling , enlarging and de-burring holes in thin sheet metal up to a thickness of 2mm. In a high quality M2 grade HSS steel with a 3 flat shank to prevent slipping in the chuck.