Most of the twist drill bits you and I come across are sharpened in a manner that produces a chisel edge with the relief behind the edge falling away from it in an arc. Manufactures employ this method because its cheap and quick to produce but its also notoriously inaccurate and bits dull relatively fast. Theyre fine if you just need a hole but some of us want more and Tormek has produced a jig that makes it relatively cheap to get it. The Tormek DBS-22 accurately produces 4 facet edges on twist drill bits. Why is that important? Think of it in terms of your drill bit now having two sets of edges, each with a primary and secondary bevel meeting exactly in the center. Bits sharpened in this manner dill accurately sized, straight holes and stay sharp longer. The DBS-22 will handle bits from 1/8 to 7/8 and will fit all Tormek models.