Sniper Model G36 Set of 3 Picatinny/Weaver Accessory Rails (Left 7 Slots, Right 7 Slots, Bottom 13 Slots) 3 rails in Right, Base, and Left Rails with 7 slot and 13 slots Precision Machined Air Craft Aluminum Material 2 x 3 7/8 and 1 x 6 - each with two screw holes Includes 7 screws (requires 6, 1 is spare)