Hardened steel dies art. 4412 Hardened steel dies profile according to drawing. To mark aluminium, brass, silver, gold, iron and steel alloys that have not undergone heat treatment. Characterics: special heat treatments for each specific need; specific engraving dephts and taper according to the material to be marked. Types of marking surface and usage: - flat: for flat surfaces; - concave: for curved surfaces and pipes; - convex: for concave surfaces or the inside of curved pieces; - flat curved: for sectors of circles.