MDT’s Picatinny rails are designed to be a reliable addition to our chassis systems when installing various accessories on your bolt action rifle. They are machined from 6061-T6 aluminum, then hard-anodized black for a durable finish. SPECIFICATIONS MIL-STD-1913 & STANAG 4694 spec rails CNC machined from 6061-T6 aircraft grade aluminum Mil-Spec Type II hard anodized Contoured for snag-free operation. QD flush cup sling mount on the 5.0” rails only Screw spacing is 1.6” center to center (common with other reputable rail brands) Height 9.4mm (0.370”) HARDWARE INCLUDED 10/24 flat head screws 10/24 weld nuts for installation on AR15 style handguards