The 58517-3 is PRO-CRIMPER III commercial grade hand operated crimp tools for crimping a wide range of terminals and contacts. These PRO-CRIMPER III commercial hand tools have a precision construction of durable high-carbon steel with extra strength pivot pins for long lasting performance. Commercial grade crimp tools use SDE (Standard Die Envelope) technology. SDE technology enables the dies to be used in different types of tooling within the same SDE system including, battery, pneumatic and electric tools. This crimp tool is for use with AMP CST 100 series and wires range from 26 to 22AWG contacts.