The 400 MCM Aluminum 6T U Style Die is the Most Accurate Way to Crimp, producing cULus classified crimps according to the UL 486A-B classification standards for #8 - 750 MCM Copper & Dual Rated Anderson, Blackburn® Burndy, Ilsco, Panduit, Penn-Union and Thomas & Betts Connectors. MILWAUKEE® U Style Dies feature vivid wire size markings and industry-standard color markings. The aluminum crimper die also imprints wire size onto the connector after crimp completion. The crimping die is made for commercial electricians and is designed to provide you with ease of use and easy inspection. For use with our M18™ Force Logic™ 600 MCM Crimper (2679-20) and M18™ 750 MCM U Style Crimping Jaw (49-16-U111).