Yankee Hill Machine Bipod Adapter For Picatinny Rail. Made from aircraft grade aluminum with hardcoated anodized matte black finish. Easily attaches using a 7/64 inch Allen wrench. Specifications for Yankee Hill Machine Bipod Adapter For Picatinny Rail YHM-638: Mfg Item Num: YHM-638 Type: ACCESSORIES - GUN ACCESSORIES - GUN PARTS Master Model Header: Bipod Adapter The Yankee Hill Machine Bipod Adapter For Picatinny Rail YHM-638 is a quality addition to the Yankee Hill Machine lineup. For more great deals on Gun Accessories by Yankee Hill Machine please browse our Yankee Hill Machine Weapon Accessories page.