Dead Air Wolverine Thread Insert .35 Cal. 14x1mm LH AKMDead Air Wolverine Thread Insert . 35 Cal. 14x1mm LH AKM Thread insert designed for . 35 caliber with a 14x1mm LH thread pitch; Compatible with Eastern European AKs and most US made parts kit barrels; Works with Wolverine Collars (M14 Collar required); Compatible with Dead Air Wolverine suppressors; Ensures precision alignment and secure fit; Supports a variety of AK builds, including WASR 10, Yugoslavian AKs, Polish, East German, Romanian, Russian