The VT Magazine Floor Plates are flared with grooved non-slip scallops for positive finger purchase. Stubborn magazines are easily extracted whether muddy" caked with ice or sand. Great for one handed reloads too. Just hook the magazine floor plate under your belt and extract quickly. Molded dimples allow for easy marking and numbering of magazines. Fits Smith & Wesson M&P magazine calibers 9×19" .40" .357 SIG (Full size magazines ONLY)