Yankee Hill Rifle Length Diamond Series Forearms feature diamond shaped hear vents, an extended top rail for gap-free installation, 'T' marked rails to mark accessory locations, and they accept Yankee Hill end caps. The Rifle Length Forearms utilize anti-rotation screws for secure installation. The forearms and barrel nuts are made of 6061-T6 aluminum and hardcoated to military specifications. The jam nut and anti-rotation screws are steel and plated a matte black finish to match. The Rifle Length Diamond Series Forearm assemblies include: one jam nut, one barrel nut, two anti-rotation screws, and one forearm tube. Overall Length 12.5 Inches. Weight 19.8 oz.