The crimper is steel After black oxidation treatment, it is rust proof, and can be used for a long for time The handle with ergonomic design will provides comfort and reduced hand fatigue design to strong grips in any condition, provides leverage and increased comfort making the grip adjusting The crimp pin connector is and metal, tin plating, inset pure copper to increase the conductivity, the surface with antioxidant coating to extend its When worked with the tool, which will help you get the connectors crimped to the wires nicely There is a ratcheting mechanism design for this insulated terminals crimping tool, one-hand could make a perfect crimp without too much effort The ratcheting function allows to secure a wire connector while you can insert the wires into the crimp, Manufacturer: Kaeltsyn