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 w/Glock 42/43/43X/48, except MOS.