Klein's ScotchLok Connector Crimping Pliers are made from custom, US-made tool steel. Hot-riveted joint ensures smooth action and no handle wobble. Induction hardened cutting knives for long life. Plastic-dipped handles* for comfort and ease of identification. Crimps and seats UG, UR, and UY connectors. Curved handles for greater control. Induction hardened side-cutting knives for long life. Spring-loaded action for self-opening. Scotchlok? is a registered trademark of 3M.