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 Glock magazine calibers 9x19"" .40"" .357 SIG"" .45 GAP. NOT compatible with early Gen 1 non-metal lined magazines. Is compatible with Gen 5 models 17"" 19"" 26"" 34 & 45.