Pertronix (T3001) Quick Change 6-Piece Ratchet Crimp Tool Kit Crimps the 5 most common automotive solderless terminal types. Non insulated, insulated, D-sub, open barrel, and spark-plug terminals Hardened die sets are zinc plated Chrome-Moly for extra long life. Ratchet crimp mechanism make precise uniform crimps every time Rugged carbon steel tool body with corrosion resistant black oxide finish Ergonomic non-slip rubber grip. Adjustable crimp amount. Ambidextrous design. Plastic storage case.