I wanted to have a holder or bracket for storing Surefire G2X flashlights and keeping them handy. The mount uses two screw holes, sized at 5mm. These screw holes can be used with #10 or #8 wood or drywall screws. 10s fit a little more snug, but 8s with countersunk heads will center up just fine.

Sample piece printed with Polymaker PolyLite PLA Pro in Black. No supports used, print screw holes down as in second picture.

Should also work with Streamlight PolyTac without the clip, but I'll have to get one to test.