Interstate Pneumatics H6 V-Grip Type Crimper has 2 openings – Die outer diameters (OD) are 0.560" and 0.725". It can crimp 1/4" and 3/8" hose inner diameters (ID). Crimpers are extremely important for permanent hose assembly and repairs. These crimpers are designed for use with brass ferrules to provide fast and easy hose assemblies. It provides production capabilities and "big tool" crimping advantages at a much lower cost. These crimping pliers are designed to reduce fatigue with repetitive work and feature a self releasing mechanism.