Drills made of hss steel much harder than conventional wood drills made of tool steel or cr v suitable for drilling hardwood species such as oak teak ipe bangkirai and other exotic wood species the special bevel of the tip allows a bore with up to 30 angle with slr marking when rotating continuous lines appear on the drill which support a controlled drilling depth features in patented clip on cassette easy opening at the push of a button good visibility of the relevant elemen