punch with flat 1,Quality Assurance: ISO9001 2,Materials: HSS M2, SKH9, ASP 3,as custom inquriy 4,8-10 work days punch with flat Specificationspunch with flat Type circular, Square Header , hexagonal , R-shaped…punch with flatMaterialHSS M-2, SKH-9, SKD11,ASP23,ASP30...punch with flat Surface TreatmentTIN TICN TIALN CRN ..punch with flat Length Tolarance+/-0.01punch with flat Diameter Tolerance ...