TE Connectivity CERTI-LOK Crimping Dies A range of die sets for use with the CERTI-LOK hand crimp tool frame assembly, stock number 817-325. Each die assembly consists of a stationary die with wire size markings that correspond to the crimping chambers and a moving die. These CERTI-LOK crimping dies are can be used to crimp a wide range of crimp terminals are easy to install and remove from the crimping tool.