Fits Compact size 9mm 1911 (Flush-Fit); 8 round capacity with numbered tube; Easy to load and seat with the slide in battery; Positive slide lock when empty; .025" Tube Walls - thickest in the industry; Superb feeding with a wide range of ammunition types; Steel Follower for flawless slide lock - even with marginal pistols; Stainless Steel ETM has the strongest magazine tube yet developed, virtually eliminating feed lip cracking, tube spread and cracking and general fatigue; Observation Slots moved to the rear of the tube, located exactly where they need to be to maintain the structural integrity; Removable Base Pad for easy maintenance and versatility with different base pad options