Low-profile, molded polymer coupler clamps together three factory 10/22 magazines to put 30 rounds at your fingertips for super-fast reloads without fumbling for the next mag. More economical and less bulky than high-cap "banana" magazines, and easy to use. Slide the mags onto the TriMag and secure them by tightening the stainless steel crossbolt with a slot-head screwdriver or even a coin. Loosen the bolt to release the magazines for single use again.