Ball-Lock & Triact-Lock: Auto-locking system with lock indicator. Button indicates when the gate is locked. * Resists accidental opening when locked. Easily opened with one hand * Screw-Lock: Manual screw gate locking system - red band provides a visual warning when the carabiner is unlocked * For connecting belay/rappel devices or use at the end of a lanyard * D-shape has the highest strength-to-weight ratio of all carabiner designs. Weight 2.6oz / 75g