This ''Follower Kit'' is for use in CZ small frame (75/SP01/Shadow), 9mm mag manufactured by Mec-Gar (tube marked ''CZ-75-9mm'', 17 round), or factory supplied mag (2nd gen, tube marked with ''CZ'' emblem, ''9mm''-17 round, or ''40''-12 round). This kit is designed for a mag OAL that measures up to 145mm long and includes a ''Grams Format'' follower (CMG) & (11) coil spring.