Designed for use with all M-LOK compatible hand guards and forends, our 9-slot M-LOK Aluminum Rail Sections allow the attachment of various 1913 Picatinny-Spec rail-mounted accessories such as lights, vertical grips, etc. Machined from Mil-Spec anodized aluminum, M-LOK Rail Sections also feature beveled ends to reduce snagging and eliminate sharp corners and edges. All hardware necessary for attachment directly to M-LOK slots on either aluminum or polymer hand guards and forends is included. 9 usable slots and a max overall length of 4.1".