MILLER TWIST LOCK CARABINERS WITH SPRING LOADED KEEPERS ARE USED AS ANCHORAGE CONNECTORS. THE 17D-1 HAS A 1"" GATE OPENING AND IS PLATED TO RESIST RUST AND CORROSION. RATED FOR 400 LBS. MAXIMUM CAPACITY. MEETS OR EXCEEDS OSHA 1926.502 ANSI Z359-2007 AND CSA Z259.12 REQUIREMENTS.