The Black & Decker 90597573 Hedge Trimmer Blade & Gear supports effective cutting and proper blade movement in compatible hedge trimmers. This replacement assembly combines the cutting blade and gear, with the gear transferring motor power to move the blade during operation. The blade then cuts branches and foliage as it moves against the fixed cutting surfaces. Proper function supports consistent trimming and smooth tool operation. It is suitable for replacing worn or damaged components during maintenance or repair. Installing a correctly fitted replacement can help restore cutting action and maintain normal hedge trimmer performance.