Quick Detachable; Positive Locking - The Industry Standard
Absolutely fail-safe and won’t ever open accidentally. The plunger sleeve on the SwiveLock screws in to lock, and unscrews to release, the gate. Super Swivels fit any Uncle Mike’s base and interchange with the older QD 115 BL sets. Set includes 2 blued swivels, 1 wood screw mount, 1 machine screw mount and nut.
Big Book Catalog, Issue:66, Page:239