The DP series of tappers are ideal for tapping threads into numerous alloys, as well as aluminum and steel. The capacity of these tappers for cutting can range up to M14 threads into a steel material. For an m16 re-tapping, there are two designs offered. One is the Pistolgrip, in which the reverse and start are activated by a dual trigger or a slide trigger. The other design is Inline, which uses a start lever and a push-pull function reverses, at double the speed.