Precision CNC machined from heat treated 4140 bar stock these sights are designed to withstand the rigors of hard duty use. The sight features a. 140" wide U notch for fast alignment with tritium dot or gold bead front sights. The rear face is serrated at 40 lpi to reduce glare in varied lighting conditions. The sight blade is thick enough to allow setting tritium vials as dots or bars if one so chooses and is contoured and dehorned for comfortable handling and carry. Plain black blade finished in matte black manganese phosphate. Fits all Glock models in all calibers. This rear sight is not compatible with Glock factory front sights (to include Trijicon Meprolight Glock night sights) and should be used in conjunction with 10-8 front sights or similarly dimensioned aftermarket front sights. In most Glock models this rear sight will be compatible with a. 215" front. User installation instructions included.