Please visit my website for the latest products and best price Ventilator Rail Covers for MLOK Handguards (rail covers are sold individually)8 air channels have been placed straight through the length of the rail to reduce thermal bridging which makes the rail heat up slower and cool down faster. By utilizing basic thermodynamics these will keep your hands cooler than any other rail cover period.Texture: it's knurled, it will always be knurled because it gives an omnidirectional grip surface that is superior to other textures. The included screws are the proper length so they don’t protrude much past the nuts when tightened, which also helps to conduct less heat and reduces the chances of interference inside the handguard. Speaking of the heat, not to worry because these rails will hold strong until well over 350°F (at which point you should reflect on your life choices and how you got there).Key Features & BenefitsFits Rails with up to 16.5mm/0.652" Wide Flats: Compatible with BCM MCMR, Midwest Industries, and most major rail makers.Wing Design: Covers one main flat and extends half a flat to the left and right, ensuring comprehensive protection.Heat Shield Technology: 8 air channels reduce thermal bridging, making the rail heat up slower and cool down faster, keeping your hands more comfortable.Omnidirectional Grip: Knurled surface pattern provides superior grip in any direction, enhancing control and stability.Efficient Installation: Requires fewer pieces and screws compared to other brands, making installation quicker and easier.Available Sizes and Configurations: Comes in 2, 3, and 4-slot sizes, with both "Full Wing" and "Half Wing" options for versatile accessory mounting.Quality Construction: High temperature resistant (350f+) carbon fiber reinforced polymer. Stainless hardware with low profile screws reduces chances of parts interference inside the rail.-Installation Instructions: Apply medium strength thread locker to all screws. Align cover with rail, seat rail cover, ensure nuts rotate 90° while turning screws. Seat both fasteners so they are just making contact. Double check cover is seated flush then tighten fasteners 1/4-1/2 turn. -DISCLAIMER: M-LOK is a registered trademark of Magpul Industries Corp. Daniel Fitch Defense is not affiliated with or endorsed by Magpul Industries Corp. Any use of the term M-LOK is solely for the purpose of identifying the compatibility of our products with Magpul Industries Corp.'s M-LOK system.-DISCLAIMER: 3D printed parts are aesthetically different than traditional injection molded parts and may have physical properties that may be perceived as flaws or defects by you the consumer. These visual differences are simply artifacts from the manufacturing process and have no effect on the parts functionality. These may include but are not limited to: fine polymer "hairs", stringing, layer lines, inconsistent finish, etc. Rest assured each trigger is thoroughly inspected throughout the manufacturing and assembly process to ensure quality.-DISCLAIMER: All parts are to be installed by a licensed gunsmith. I am not liable for any use or misuse of this product that results in any form of injury or death of you or others under any circumstances. Firearms are dangerous, it is up to the user to ensure all safety systems are operational and working at all times. Safety of yourself and others is solely your responsibility.