TAKE ALL OF THE GUESSWORK AND CLUMSY CHARTS OUT OF DRILLING HOLES FOR TAPPING. WITH THIS SET ALL YOU NEED IS THE FINE METAL CASE TO QUICKLY SEE THE CORRECT DRILL FOR THE TAP YOU NEED. M2X.45 TAP WITH 2.05MM DRILL M3X.50 TAP WITH 2.5MM DRILL M4X.7 TAP WITH 3.3MM DRILL M5X.8 TAP WITH 4.2MM DRILL M6X1.0 TAP WITH 5MM DRILL M8X1.25 TAP WITH 6.7MM DRILL M10X1.5 WITH 8.5MM DRILL M12X1.75 TAP WITH 10.2MM DRILL 1/2-20 WITH 29/64 DRILL METAL CASE CONVENIANCE AND QUALITY AT AN UNBELIEVABLE LOW PRICE!!!!