Clip to clip onto backpack shoulderstraps to keep the rifle(sling) from falling of the shoulder.

Fits straps up to 27mm wide and up to 1mm thick.

The clips is with a printinplace hinge. I have printed 10 of these now, none of them has broken but all of them was real tight to get going. Hold near the hinge and wiggle a little with added pressure until it gets loose.