This Double Harley Head Plate is designed to accommodate two heads at the same time. Its unique design gives perfect alignment of the centerline of valve guides, providing repeatable accuracy from head to head. The plate is heavy enough for cutting and installing guides and seats. It is designed to be used on a seat and guide machine or Bridgeport-type Mill, including CNC machines. Measures 10" x 22" x 1" thick and includes 3/8" dowel pins. Blackened steel construction. Fits Evolution, Twin Cam and Sportster heads.