The Dewalt N531551 String Trimmer Gear Case Cover protects and encloses the gear case components of compatible string trimmers. This replacement cover fits over the gear case, providing a protective barrier around the internal gears and helping keep them properly enclosed during operation. It works with the trimmer’s gear case assembly to shield internal parts from normal contact and ... https://www.wholetoolbox.com/dewalt-n531551-string-trimmer-gear-case-cover/N531551.html