Designed for use with all M-LOK compatible Hand Guards and Forends the Magpul M-LOK Aluminum Rail Sections allow the attachment of various 1913 Picatinny spec rail-mounted accessories such as lights vertical grips etc. Machined from milspec-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. 5 Slots max overall length of 2.5".