J frame for use with:
S&W Models 36, 36LS, 37, 38, 49, 60, 60LS, 442, 640, 649
Ruger SP 101 Series, .38 Sp. & .357 Mag

K frame for use with:
S&W Models 10, 13, 14, 15, 19, 64, 65, 65LS, 66, 67
Taurus Models 80, 82, 83, 86, 65, 66, 66CP, 669, 669CP, 689

L frame for use with:
S&W Models 686, 586
Ruger GP 100 Series all models