350 MCM Gauge Non-Insulated Red 1/2" studsize 350 MCM, 1/2" stud, two-hole copper compression lugs. The double stud connections allow you to secure this lug in two places. The extended barrel allows you to easily make a double crimp, for good wire contact. The sight hole allows you to ensure your wire is inserted properly, plus it's UL Listed and can be used up to 600 volts.