The BCM 5.5" Nylon KeyMod Rail Section provides reliable Picatinny rail mounting capability with lightweight impact-resistant polymer construction and Mil-Standard 1913 specifications.BCM KeyMod Picatinny Nylon Rail Section - 5.5" BlackLightweight impact-resistant polymer constructionCorrosion-resistant stainless steel mounting hardwareMil-Standard 1913 Picatinny Arsenal specificationsSnag-resistant design while retaining Mil-Standard specsSelf-contained assembly prevents hardware lossCompatible with all KeyMod interface mounting surfacesDesigned for non-load bearing accessories on AR-15 platforms. Maximum torque specification of 20 in/lbs for KeyMod fasteners. For load-bearing applications aluminum rail sections are recommended.