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The ISC Twister Carabiner features a swivel connection point and a blind nose, which improves performance by reducing snagging. The barrel has been designed with a square cut notch to limit debris build up and this carabiner has 3 gate barrel options. The gate barrels are color-coded for quick and easy identification. The screwgate barrel is black, the twistlock (double-action) barrel is yellow, and the supersafe (triple-action) barrel is red.