Pratt & Whitney R-2800 Double Wasp Radial Engine Piston WWII Desk Clock off F4U CORSAIR WARBIRD (RAW EDITION) Piston has been removed from plane and blasted to bare aluminum Piston Measures 5 3/4 inches in Diameter X 4 1/4 Inches High. Clock Measures 3 1/2 inches Machined at a 70 degree angle for your viewing pleasure Uses one AA battery (not included)