Two, green, tritium-filled vials in the rear plus a single tritium vial in the front blade provide an easy-to-find, 3-dot reference point.
SPECS:
Aluminum, black, matte finish, with green tritium inserts. +0 .180" high front blade, fits Glock 17, 19, 22, 23, 24, 34, 35. +1 .160" high front blade, fits Glock 20, 21, 26, 27, 28, 29, 30, 31, 32, 33, 36. Includes screws, Allen wrench and instructions.
Catalog page 285