B19B1 Chicago Pneumatic Pistol Chisel Scaler The B19B1 Chicago Pneumatic Pistol Chisel Scaler is designed to be a chipper with a hexagonal 5/8” shank and a cushion grip for better operator comfort and can be used for heavy duty. This pistol scaler is suitable for very intensive use and the robust construction and Power allows that use. The B19B1 Chicago Pneumatic Pistol Chisel Scaler is easy to change from chipper to needle scaler fast and efficiently.