Draper Knipex 97 53 04Sbe Self Adjusting Ferrule - 97 53 04 SBProfessional Quality, mixed construction with special steel for stressed parts, oil hardened and tempered. Calibrated in the factory, these crimping pliers are designed to reduce fatigue with repetitive work and feature a self releasing mechanism. Use specifically with insulated ferrules, these crimping pliers produce a square section for optimum contact in the connection. Heavy duty moulded handles and slip guards for extra comfort and safety.