Signstek HSC8 6-6 Self-adjustable Wire Crimper Plier Crimping Tools for 0.25-6.0mm2 Cable End-sleeves Self-adjustable Ratcheting Ferrule For 23 - 10 AWG (similar to 0.25 - 6 mm) Ratcheting crimping tool for ferrules (end sleeves) Hexagonal crimp profile with six serrated crimp surfaces Portable & compact structure, small size, simple operation