Sylvan Arms QD rail mount combo is the best combination for attaching your firearm accessories and sling. They are designed for quick and easy removal and attachment for on the fly changes either in the field, on the range, or tactical applications. Designed for M-LOK Rails and made from 6061-T6 aluminum with black anodized finish. Inludes: (1) 7 slot picatinny rail mount. (1) 3 slot picatinny rail mount. (1) Sling quick disconnect.