*Please note the actual look of the tail cap differs from model to model.* Type A: for flashlights with a 1" body size. including: Chameleon Series: CR6, CG6, CB6, CU6, CI6 Multitask Hybrid Series: MH12, MH25, MH27, MH27UV, MH2C, MH41, MH25GT, MH12GT Multi-Task Series: MT10C, MT26, MT40, MT40GT, MT22C, MT42 Precise Series: P12, P12GT, P16, P25, P16TAC, P26, P30 SRT Series: SRT6, SRT7, SRT7GT NOT compatible with MH12V2, P12 NEW, P30 NEW, MH12GTS, MH25GTS, or any light using a 21700 battery. Type B: For MT1A, MT2A, MT21A, MT10A, MT20A, MH1A - (Type B is not compatible with the MT2A Pro) Type E: For EC11 Type J: For EC4S/EC4SW (Discontinued) Type K: For TM03 (Discontinued) Type L: For MH20, MH20GT (Does not work for MH23) Type R: For E4K Type S: For HC35 Type T: For MT21C Type U: For MH12 V2, MH12S, MH12SE, MH25 V2, MH25S, P12N and P30N (the new models that use 21700 batteries) - Discontinued. Get NTC2 tail cap instead. Type V: For P10i, P20i, P10iX, P20iX, P23i (the new models that use the NL2150HPi batteries) -or you can get its upgrade NTC2i tail cap with guard rails. Type W: For P30i, P35i Type X: For MH12 Pro, MH25 Pro Type Y: For MH10 v2 Type Z: For MT2A Pro