The bi-metal hole saws leave clean cuts in wood, PVC, non-ferrous metals, and aluminum. The two adapters (for hole saws from 14 to 29 mm and from 32 to 152 mm) come with a universal centering drill bit. Wood and PVC can be processed up to a thickness of 30 mm, while non-ferrous metals and aluminum can be worked on up to 5 mm. Thanks to the hexagonal shank, the hole saws are compatible with all cordless drills and corded drills that have a quick-change chuck. A spring ejector is included for quicker removal of the cut-out piece from the hole saw, which pushes the material out from the inside.