The Helmet ASR ARC Side Rails Kit System provides a lighter, stronger, and more functional side rail than many other systems on the market today. Universal rail system mounts many accessories Fits Picatinny and other common adapters 15% more track length 30% lighter than existing rail systems (.24 lbs vs .36 lbs/110 grams vs 165 grams) Available in a wide variety of colors and in 4 sizes (S/M/L/XL). Compatible with full gamut of MICH/ACH helmet sizes and shapes (high-cut, mid-cut, and full-cut) Available in both, no-screws (boltless) and hardware (bolted) solution version. The Boltless version meet up to 100 lbs./44 Kg. pulling test. INTEGRATION AND COMPATIBILITY WORKS IN CONJUNCTION WITH ALL ArmorSource ACH helmet systems. WORKS IN CONJUNCTION WITH ALL supported retention and suspension systems. WORKS IN CONJUNCTION WITH ALL ArmorSource supported accessories. COMPATIBLE WITH COMMON communications, gas masks, visors, eyewear, ear protection and mandibles.