IWC THORNTAIL Offset Adaptive Picatinny Light Mount (1.0" Ring Size) Light Mounting Ring securely attaches round body hand held light toSMC, TMC, RADIAL, DROPWING or THORNTAILLight Mounts made by Impact Weapons Components. Fits: 1.000" /SUREFIRE- 6P, 6PX, 9P, G2X, FURY. EAGLETAC- T100C2 Mark II. ELZETTA- ZFL-M60. FENIX- TK10, TK11. STREAMLIGHT- All SCORPION, All PolyTac