The brite-site tfx features fully-protected tfo technology encapsulated in a virtually indestructible configuration impervious to oils chemicals cleaning solvents and ultra-sonic cleaning processes.These sights provide unmatched visibility in all shooting conditions 24/7 utilizing swiss tritium for maximum brightness.Glowing in the dark without the use of batteries the concealed fiber cannot be seen by target.Additionally tru-glo's fortress finish provides a permanent protective coating for maximum protection and this snag-resistant design fits standard holsters.This low mount model is compatible with glock 17/19/22/22/23/24/26/27/33/34/35/38/39 excluding mos models.Rear Color: GreenType: Tritium/Fiber Optic SetFrame Material: SteelFrame Color: BlackFirearm Fit: Glock 17 19 22-24 26-27 33-35 38-39Style: 3 DotFront Material: Tritium/Fiber OpticRear Material: Tritium/Fiber OpticFront Color: Green w/White OutlineWindage Adjustment: NoElevation Adjustment: NoFirearm Type: Handgun