Nylon insulated ring terminals 2 GA-red silver brazed seam that will not open while crimping . These terminals provide effective and consistent performance in a variety of industrial, marine, military and aircraft applications. Manufactured by 3M. The color reflects wire size per awg code. Temperature range: -40 - 221 degree F. UL listed and CSA certified for 600v building wire and 1000v signs and lighting fixtures.