Zaffiri Precision Suppressor Height HD Fiber Optic front Sight Set. High quality, NOT hollow, has a set screw on rear, uses stainless front screw - features you won't find on competitors at this price. IncludesFront Sight: 0.305a ^2 Serrated Tall and Stainless Steel screwRear Sight: 0.310 Serrated Tall with 0.125a ^2 Wide notch featuring shortened front ledge that will fit slides for an optic. Includes 6-40 x 1/4a ^2 rear set screw *NOTE* Does not fit Glock MOS, G42, or G43Front Sight uses standard hex driver. Rear Sight uses 1/16a ^2 Allen wrench for set screw. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.