Compatible with M-LOK attachment systems only; MIL-STD-1913 and STANAG 4694 spec rails; CNC machined from 6061-T6 aircraft grade aluminum; Mil-Spec Type II hard anodized; Laser etched position markers for quick reference; Contoured for snag-free operation; Height 9.4mm (0.370"); 10/24 flat head screws in 1/2" length and M-LOK nuts included