We believe these are some of the best sights for the price on the market right now. High quality, NOT hollow, has a set screw on rear, uses stainless front screw features you wont find on competitors at this price. Standard height sight set (NOT Suppressor Height) Includes: Front Sight: 0.195 Serrated Tall and Stainless Steel screw 1.5mm Red Fiber Optic Rear Sight: 0.200 Serrated Tall with 0.125 Wide notch featuring shortened front ledge that will fit slides for an optic. Includes 6-40 x 1/4 rear set screw NOTE Does not fit for Glock MOS, G42, or G43 Front Sight uses standard hex driver. Rear Sight uses 1/16 Allen wrench for set screw.