These cleverly designed magazine pouches offer features very few others do and work perfectly with our new DAA Competition Belt.They are compatible with ALL double-stack magazines, from small CZ type 9mm mags to full size STI mags. No parts are needed to change from one mag type to another – just move the rollers to the next holes and tighten up as needed! Couldn’t be simpler. The magazines are completely ambidextrous – suitable for right and left hand assembly. They offer an exceptional range of adjustment. And they offer the very firmest grip as well as the smoothest release on the market, thanks to the double set of rollers and the flexible material used.