Pneumatic Auto Cutter IV. The Automatic Cutter II is ideal for cutting nearly any smaller hook-up or conducting wire, coax cable, heat shrink or flexible tubing. It will cut materials such as: Hook-up wire, (12 to 40 Awg, or equivalent) Flexible tubing, (to 3/8″ OD), rubber, silicone, PVC, vinyl, etc. Heat shrink tubing (to 1/4″ OD)