"Lewis" pattern with crest of thread, main cutting edge and taper tap, morse cone shank No. 2. For drilling precisely fitting holes in all European solid woods. For joinery machines taking up morse cone No. 2. For hard wood and exotic hard wood like Bongossi we recommend the auger bit with knife, our product line 1493. Larger diameters can be combined with our product line 1410/1493 and morse cone No. 2 adapter (product line 1488). Alloyed tool steel. 1250 - 2500 rpm e.g. Ø 22 mm 1500 rpm in soft wood.