Gardner Bender crimp-type Vinyl-Insulated Ring Terminals. 6 AWG, 3/8 in. Blue. offer a 600-volt maximum rating for building wiring applications and a 1,000-volt maximum rating for signs and fixtures. Vinyl-insulated barrel Color Blue Designed for 6 AWG and 3/8 in. stud size 600-volt maximum rating for building wiring a