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. 3 Slots, max overall length of 1.6". Made in U.S.A.

https://invictusgearcompany.corefire.shop/product/magpul-mag580-blk-m-lok-3-slot-aluminum-1.6-black