Fully Adjustable Shotgun Sight Set for Ribs 6mm to 8mm wide. Package contains: 1 slug rear sight with green fiber optic. (TS037F) Adjustable in windage and elevation. Fixing on the rib by means of screws. 1 red fiber optic front sight body (MF17). Fixing on the rib by means of screws. 1 Adjustment screwdriver. 1 allen wrench and assembling instructions.