The M-LOK accessory rail allows you to mount sights lights and other tactical accessories to your M-LOK forend. Includes: M-LOK nuts screws and hex wrench. Specifications: - Weight: 0.8 oz (including M-LOK nuts and screws). - 2 5/16 long. - Accessory Rail can be placed at 3 6 and 9 o clock positions and can be joined to create continuous Pic Spec Rail. - Made from 6061-T6 Billet Aluminum. - M-LOK is a modular locking accessory mounting system developed by MAGPUL. - It adjusts in 1/2 slot increments for precise accessory placement. - No access to back side of the rail is required. - Accessories can mount with either end facing forward. - Works with both metal and polymer accessories.