The Phase 5 Low Drag, High Visibility 12 Gauge Shotgun Follower (12GSF) is designed to feed smoothly with no binding in most factory 12 Gauge magazine and extension tubes. The 12GSF is precision machined from solid 7075-T6 aluminum bar-stock in the U.S.A. and comes with bright white lettering and a center hole to help verify that the magazine tube is clear by sight and touch. Features: 7075 T6 aluminum Smooth feeding No binding Anodized