TruGlo’s Fiber Optic sight set uses traditional fiber optics for bright aiming points, even in low-light conditions. The system utilizes Truglo’s Tri-Dot aiming system by contrasting front and rear colors. It is constructed of CNC-machined steel, concealing the fibers so they cannot be seen by your target, and has TrulGo’s Fortress Finish for a permanent protective coating and maximum protection. It has a snag-resistant design and fits standard holsters. . Front Sight Length: 1.0″. Front Sight Width: 1.0″. Front Sight Height: 1.0″ Rear Sight Length: 1.0″. Rear Sight Width: 1.0″ Rear Sight Height: 1.0″. Compatible with Glock 17/17L/19/19X/22/23/24/26/27/33/34/35/39/45 Except MOS models.