HHIP Precision hand tapper conversion kit. This kit upgrades your tapping accuracy and stability. It works for the same type hand tapper with a 50mm diameter spindle. The kit includes a handle, a spindle, a tapping head, a hook wrench and an Allen Wrench. The tapping head is a high torque head with improved stability. The tapping range is 1/8-1/2" & M2-M13. This precision conversion kit is designed to improve the rigidity of a conventional hand tapper spindle with tapping adapters.