Uni-Stud AL/MG 0.157 in, 250 Pack 0.157 in (4 mm) threaded welding studs designed for dent repair in aluminum automotive panels. Aluminum/magnesium alloy flange stud type. Load voltage for 0.157 in (4 mm) aluminum flange studs 90 volts (guideline). Electric capacitor discharge welding process. Convenient reclosable shell in quantities of 250 or 500 (by weight) 1142 No -