This is a 250 kcmil stranded connector with a 3.75 inch body and a 1.11 in (28 mm) O.D., that are for splicing applications on aluminum or copper cable products
The 3M™ Connectors CI Series are for splicing applications on aluminum or copper cable conductors. The aluminum connectors CI Series are specially designed for use with 3M™ QS-I, QS-II and QS-III pre-molded power cable splice bodies. These connectors meet the requirements of ANSI C119.4.