These sights are billet machined from 360 Brass. Designed to fit Glock 19/17 model slides with heavy chamfers without protruding out of the dovetail. Being thinner than normal pattern sights width wise also allows these to fit inside the slide profile of the 42/43 family though they do protrude slightly. These will fit all models of glock pistols but ideally designed for the double stack models. These sights have giant 2mm diameter tritium tubes, more than twice the diameter of most others on the market. We also offer colors of tritium you won't find in other night sights such as ice blue, purple and white. Every edge of the bodies have a .02'' radius applied to prevent snags and hangups, as well as comfort for the IWB carrier. Please allow a week for preparation and shipping, the custom color and tritium options are applied at the time of order.