Designed for use with all M-LOK compatible Hand Guards and Forends"" 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. 9 Slots"" max overall length of 4.1"". Made in U.S.A.