Ultra 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.