High quality sight systems offer exceptional brightness in a low profile configuration that won't hang up in your holster or slow you down. CNC machined, steel construction provides superior durability for combat or competition. Dovetailed rear with set screw (except Sure-Sight) and screw-on front sight makes replacement of Glock factory sights fast and simple. All sights, except Sure-Sight, match factory sight height. High quality, self-illuminating, tritium tubes glow bright green so you can find your sights, even in complete darkness. Surrounding white ring shows up well in daylight. Popular, three-dot system provides fast sight alignment in high stress situations. No-snag design Mfg: Truglo SPECS: Steel, matte black. Sight heights same as factory. Front - .970" (24.6mm) long, .142" (3.6mm) wide. Rear - .650" (16.5mm) long, .720" (18.3mm) wide. 231G1 - Fits models 17, 17L, 19, 22, 23, 24, 26, 27, 33, 34 and 35. 231G2 - Fits models 20, 21, 29, 30, 31 and 32.