stamping punch,shoulder punch,die punch,countersunk punch,piercing punch Mat:SKD11.HSS.ASP.CARBIDE/TUNGSTEN STEEL.SJU2,20Cr,SKH stamping punch, shoulder punch, die punch, countersunk punch, piercing punchMaterial: SKD11, HSS, ASP, CARBIDE/TUNGSTEN STEEL, SJU2, 20Cr, SKH51customize is available MSB STRIPPER BOLT-MALE SCREW