Titanium nitride coated 52 piece tapping set the base material of special tool steel with its high quality titanium nitride coating provides the basis for professional work in a handy plastic box contents 1 adjustable tap wrench 1 threading die holder 1 centre punch 1tool holder 1 screwdriver 5 screw extractors each with a core removing hole drill 2 2 5 4 6 6 5 and 1off each tap wrench and tap die as per assembly 1 each threading die and 1 each tap die m3 x 050 m5 x 080 m7 x 075