Feature 11. Multi-size rail set: 5-slot 65mm/ 7-slot 85mm/9-slot 105mm/ 11-slot 124mm/ 13-slot 144mm Picatinny rail, 10 matching screws, 10 locking T-nuts and 1 Allen key, very Perfect for custom shooting! 22. High-quality nylon material: Made of nylon and anodized by black matte coating, the rail bracket is lightweight and durable. 33. Simple installation: use the hex wrench tool to install the screws, easy to install or remove. Perfect MLok system, once tightened, they don't come loose. 44. Compatible and perfect for connecting different shooting accessories such as torches, sights, bipods, or other accessories. 55. Packing list: nylon M-Lok rail strip*5, screw*10, wrench*1. Colour: Black Material: Nylon Net weight: 96.8g Dimensions: 5 slots 65mm / 7 slots 85mm / 9 slots 105mm / 11 slots 124mm / 13 slots 144mm Package List 5*Nylon M-Lok Rail 10*Screw 1*Wrench Note Due to the lighting effects and shooting angles, there is a color difference in the product, please understand. Due to manual measurement, there is a tolerance in the product size.