CP835 Chicago Pneumatic Air Nibbler The CP835 Chicago Pneumatic Air Nibbler is designed for good cutting control with a rugged head and 0.177” diameter punch to cut up steel up to 0.060” (16 gauge) and aluminum up to 0.102” (10 gauge). This nibbler includes easy access to punch and die for quick replacement and a lock-off lever for low speed starting. The CP835 Chicago Pneumatic Air Nibbler is perfect for accurate curring and best for tight corners and circles and should be used for nibbling plastic, tin, aluminum and other metals.