It is made of 40Cr Alloy Steel with high hardness and good wear resistance, and it is durable to use.The Pattern is clear and easy to read, which is suitable for stamping soft metals, including aluminum, tin, copper, brass, nickel silver, and wood; stainless steel is not suitable.Specification:Material: 40Cr Alloy SteelLetter Size: 6mm (1/4")Letter Depth: (Approx)1.0mm - 1.1mmSize of Each Punch: 60mm x 10mm / 2.36 inches x 0.39 inches (L*W)Package Content:1 Pcs) x Pattern Punch Stamp.