Metal Advertising Word Pneumatic Punching Gun Iron Sheet Air Puncher Stainless Steel Punching Folding Tool 90PSI 4CFM. Specification: Name: Pneumatic Punching Machine Model: BM-CK3 Punching diameter: 3/4/5/8MM (optional) Folding width: 12MM Air inlet: 1/4 Air pressure: 90PSI Air consumption: 4CFM Punching thickness: stainless steel 0.8MM, iron plate 1.2MM, aluminum plate 1.4MM Weight: 1.2KG.