(Made In ) Retraction speed brake controls blade speed and protects fingers from touching blade. Measurement scale printed on front and back sides of blade for versatility to address different types of measurements. Double hook can secure tape to items such as studs, conduit, pipes, etc. on front or back side of blade to measure with either measurement scale. Strong magnet on hook attaches to ferromagnetic objects such as steel studs, doors, panels, conduit, etc. for easy measuring.