If you are wanting a Locking Collar for YOLOtek PowerStick-53" or PS20" or other YOLOtek gear, this is NOT the Collar for you!!! Click here for YOLOtek ONLY Perko Threaded Locking Collar
Locking Collar - Perko Large Threaded - Fits large threaded navigation light ports.
Compare to your navigation light base and make sure it says Perko. Any questions, please call 800-488-5512