Night Fision utilizes an injection molded process and military-grade polymer with durable polymer tritium outlines to give you flexibility and unrivaled daytime visibility. The night sight set is a square front green tritium with a yellow outline, square rear green tritium with a white outline. Compatible with Glock models 20/21/29/30/36/40/41, including S and SF variants. Front Sight Width: 0.140″. Front Sight Height: 0.213″. Rear Sight Height: 0.240″.