-KeyMod Picatinny Nylon Rail Section-5.5"-Flat Dark Earth -Rail section is made of Lightweight Impact Resistant Polymer-Mounting hardware is made of Corrosion Resistant Stainless Steel-Made to the Mil-Standard 1913 Picatinny Arsenal Specifications-Features a Snag resistant design, while retaining Mil-Standards specs-Self-contained assembly, eliminates the possible loss of mounting hardware-Fits ALL KeyMod interface mounting surfacesNOTE: NYLON/POLYMER PICATINNY RAIL SECTIONS ARE FOR NON-LOAD BEARING ACCESSORIES ONLY. ALUMINUM PICATINNY RAIL SECTIONS RECOMMENDED FOR LOAD BEARING. DO NOT EXCEED 20 IN/LBS WHEN SECURING KEYMOD FASTENERS ON POLYMER ACCESSORIES. ALUMINUM PICATINNY RAIL SECTIONS MAY BE TORQUED TO 30 IN/LBS