Yankee Hill Machine Arca-Swiss M-LOK Rail, 3 in., Black The Yankee Hill Machine Arca-Swiss rail bolts to an M-LOK handguard so the rifle clamps straight to tripod heads and Arca accessories. This 3 in. rail is 1.5 in. wide and 1.44 oz, 6061-T6 aluminum with hard coat, and fits the RRS dovetail standard. Key Features Arca-Swiss dovetail. Fits M-LOK. RRS compatible. 3 in. long. 6061-T6 aluminum. Specifications Manufacturer Yankee Hill Machine Model Arca-Swiss M-LOK Rail, 3 in. Part Number YHM-1603A UPC 841812100652 Length 3 in. Width 1.5 in. Weight 1.44 oz Interface M-LOK Standard Arca-Swiss, RRS compatible Material 6061-T6 aluminum Finish Hard coat anodized FAQs What does it attach to? M-LOK handguards. Will it fit my tripod clamp? It fits Arca-Swiss and RRS clamps. How long is it? 3 in. Compare more rails and bases, scope rings at BattleHawk Armory.