... hardness 2,Materials: HSS M2, SKH9, SKD11 3,Customized service available 4,Long life We are a professional manufacturer of punch ... punches you need.3. the specification of standard you used, for examples:JIS,ANSI or DIN4. the screw size & header punch ... .5. the surface coating type,for example:Plain,Tin,Ticn,Tialn.6. it is also available for the specification with your own special ...