Pro series bore stand fixture made of 6061 aluminum Heavy Duty (26lbs) design with a black anodizing finish. Fits flow bench with 5″ square mount bolt pattern. Design to work with all ARE popular V8 cylinder head slider plates. Top plate has been drilled for 1/2″ dowel pin stop, also laser engraved marking locations for Gen 1 S/B 265-400 Chevy, LS2, LS3,Big block 396-454 Chevy, Big block 383-440 Chrysler, S/B 289-302-351c Ford slider plates. Bottom plate machined and installed 1/8″o-ring for leak free service. Assembly of stand is required. (Removable cylinders, head slider plates, clamp kit are sold separately.) Please email with questions.