punch part 1,Quality Assurance: ISO9001 2,Materials: HSS M2, SKH9, ASP 3,as custom inquriy 4,8-10 work days punch part Specificationspunch part Type circular, Square Header , hexagonal , R-shaped…punch part MaterialHSS M-2, SKH-9, SKD11,ASP23,ASP30...punch part Surface TreatmentTIN TICN TIALN CRN ..punch part Length TolaranceLess than+/-0.005mm as custom inquriypunch part Diameter ToleranceLess ...