UltiClip needs no introduction. They make the best way to mount your gear to virtually anything. The Slim 3.3 is one of the most common clips used for fixed blades. Period. It provides great retention and concealment and has a dual-slotted mounting area, which allows for 1.5″ (38.1mm) hole spacing. It's slightly over 1/2″ (12.7mm) wide, making it ideal for knife sheaths or other narrow applications.