The 9477 Astro Pneumatic Professional Quick Interchangeable Ratchet Crimping Tool 7PC Set features a quick changing jaw design does not require any other tool to change the jaws. Ergonomically designed steel frame handles with contoured rubber grips ensure a comfortable grip, which can be easily operated by either left or right hand, and is a time-saving tool allowing for faster crimping of terminals and wire. The 9477 Astro Pneumatic Professional Quick Interchangeable Ratchet Crimping Tool 7PC Set includes A, B, C, D, F, and H Jaws.