Huntingdoor Black Fiber Optic LED Bow Sight Light 3/8-32 Thread Universal Fit for compound bow Sight Light Black Compound Bow Sight Light fits a 3/8-32 thread Violet LED,Sight Light Replaceable batteries Easy to turn on / off Fit any universal bow sight which include Topoint, Apex, Cobra, Copper John, PSE, Trophy Ridge, TruGlo and others