An indispensable tool for automotive craftsmen will be the ratchet tap holder with reversible mechanism. The ratchet tap holder is a tool for cutting internal threads; it is a screw with straight or helical chip grooves that form cutting edges. Taps tail part is attached to the spigot, the working part is inserted into the hole, in which when turning the spigot reciprocating movements cut the thread. The working part of the tap has cutting and calibrating parts.