3 round cartridge clip with a closed loop to attach it to small belts, rifle slings, backpacks etc. Probably fits to a molle system also - fits really nice on my eberlestock backpack.

Designed for the 308, but fits any of the siblings who share dimensions in the lower part. There is a notch that fits into the groove of the cartridge. Insert the cartridge at an angle so the notch is in the groove and wedge the cartridge into the lips. The middle one is a little tight, so insert middle cartridge first. Once inserted the cartridges want fall out, and the closed loop secures the holder to what ever it fits into.