This Peterson Fluid Systems HTD pulley is a specific replacement part for certain engine or machinery setups. It's a crank-driven pulley with 22 teeth, 8mm pitch, 1.02-inch width, 1-inch mandrel (bore), and a 1/8-inch keyway. Made from aluminum with a gray anodized finish, it's lightweight and corrosion-resistant. The part number is 05-1222 (also listed as 051222). It's manufactured in the United States. This isn't a generic pulley - it's designed for particular applications that require this exact tooth count and pitch. If you're rebuilding an engine, replacing a worn pulley, or working on industrial equipment that uses HTD timing belts, this might be the pulley you need. Make sure to check your existing part or machinery specifications to confirm this is the correct replacement before ordering. The package dimensions are about 7.26 x 5.72 x 3.5 inches, and it weighs 2.11 pounds. A solid, precision-made component for when you need the right fit for your drive system.