Specification: Model No: IWD-12 For use with 12 gage(Contact Size 12) close barrel terminals. Crimp Deutsch closed barrel terminals found on motorcycles, trucks, contruction equipment, race cars, agricultural equipment, heavy duty vehicles and other vehicles and equipment subject to excessive vibration. smooth ratcheting mechanism. Model No: IWD-16 For use with 14, 16 and 18 gage(Contact Size 16) close barrel terminals. Crimp Deutsch closed barrel terminals found on motorcycles, trucks, contruction equipment, race cars, agricultural equipment, heavy duty vehicles and other vehicles and equipment subject to excessive vibration. smooth ratcheting mechanism. Model No: IWD-20 For use with 20 and 22 gage(Contact Size 20) close barrel terminals. Crimp Deutsch closed barrel terminals found on motorcycles, trucks, contruction equipment, race cars, agricultural equipment, heavy duty vehicles and other vehicles and equipment subject to excessive vibration. smooth ratcheting mechanism. Package includes: 1pc of Wire Crimping Pliers Crimper Set