CNC machined from 6061-T6 billet aluminum Polished then hard black anodize finish. Features top grade chrome plating and mounting hardware. Made in USA Use stock gasket sold separately 1996-Up models uses (2) 1/4-20 x 5/8 socket cap screws & (2) 1/4-20 2-1/2 socket cap screws 1995 and earlier models: (4) 1/4-20 x 5/8 socket cap screws