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Choice of stainless steel or triplechrome-plated hardened steel. Patented design incorporates O-ring and watertight cap to help seal out dirt and corrosion from the lock head mechanism. Full-length solid forged lock pin cannot pull out. Available individually or in keyed-alike sets. For Couplers with up to a 7/8 inch Span Features patented 1/4 turn technology that cannot be false locked.