MDT M-LOK Picatinny Rail w/Flush Cup Sling Mounts 12 Slots 5.5 inch Black. They are machined from 6061-T6 aluminum then hard-anodized black for a durable finish. The rails also feature laser etched positioning markers making repeatable set ups easier. They come in a variety of lengths feature an integral QD flush cup sling mount on select sizes and include the necessary hardware for mounting to M-LOK compatible attachment systems which are currently integrated in many of our chassis system and forend designs. SPECIFICATIONS Compatible with M-Lok attachment systems only MIL-STD-1913 & STANAG 4694 spec rails CNC machined from 6061-T6 aircraft grade aluminum Mil-Spec Type III hard anodized Laser etched position markers for quick reference Contoured for snag-free operation 11 length options QD flush cup sling mount on select sizes Height 9.4mm (0.370) Hardware included: 10/24 flat head screws in length M-Lok nuts Specifications for MDT Aluminum Picatinny M-LOK Rail: Manufacturer: MDT Color: Black Finish: Mil-Spec Type III Hard Anodized Fabric/Material: 6061-T6 Aircraft Grade Aluminum Gun Rail: Picatinny Condition: New Country of Origin: Canada Features of MDT Aluminum Picatinny M-LOK Rail: Compatible with M-Lok attachment systems only MIL-STD-1913 & STANAG 4694 spec rails CNC machined from 6061-T6 aircraft grade aluminum Mil-Spec Type III hard anodized Laser etched position markers for quick reference Contoured for snag-free operation 11 length options QD flush cup sling mount on select sizes Height 9.4mm (0.370) Included Accessories: 10/24 flat head screws in length M-Lok nuts Package Contents: MDT Aluminum Picatinny M-LOK Rail MDT 103456-BLK: M-LOK Picatinny Rail w/Flush Cup Sling Mounts 12 Slots 5.5 inch Black