16pcs Metric tap and die set 1..material:Alloy Tool Steel(9SiCr) 2..package:Plastic Case SPECIFICATION7Pcs Taps:6-32,8-32,1/4-20,5/16-18, 3/8-16,7/16-14,1/2-137Pcs Dies size as taps1PC Die Handle1PC Tap Wrench:M3-M12 How to use tap? 16PCS INCH TAP & DIE SET