Check the listing for details. 2.16in Tactical Shotgun Rifle Ventilated Rib 20mm Picatinny Rail Scope Mount. Color: Black, Condition: New. Listed at 12.53 USD. Product Description： This ohhunt Picatinny Rail is designed to work with Shotgun Ventilated Rib (no wider than 7.9mm). CNC machined from aluminium alloy with matte oxide finish. Installing the ohhunt Rib Picatinny Rail does not require any firearm building, you can take it out of the box and install it on your gun in minutes. These rails attach as low as possible on the ribs for a slim profile that provides minimal interference with your weapon build. The principle of installation consists in transverse blades that pass through the holes in the ventilated plate and are attracted by two screws. On the sides of the transition bar has 2 pins, providing additional fixation. For the IZH-27,MR-153/155, MP-233, TOZ-120, MTs21-12, TOZ-84 Note: This item is not suitable for TOZ-34 Specification: Type: Rib Mount For: Shotgun、Rifle Length: 2.16 inches / 55mm Wide: Ribs up to 7.9 mm wide Net Weighs : 0.54oz / 15 g Screw length: 0.365" Material: High quality aluminum Fit For: IZH-27,MR-153/155, MP-233, TOZ-120, MTs21-12, TOZ-84 carbine. Packaging Details: 1X Ventilated Rib