This blade guard is a genuine MTD replacement part for a lawn trimmer, which is designed to cut grass, shrubs, bushes, and weeds. The blade guard is a safety feature on lawn trimmers that protects appliance users from physical damage as a result of coming into contact with the blades.A lawn trimmer blade guard might have to be replaced if there is damage to it that reveals the blades, thereby endangering the appliance user through exposure to the sharp blades. If the blade guard is damaged, it must be removed and replaced immediately, as the lawn trimmer blades should be protected with an adequate housing device. To remove and replace a blade guard for a lawn trimmer, one will need a flathead screwdriver. Remember to always wear gloves when handling, repairing, and operating outdoor equipment. This blade guard is compatible with the following brands: Ryobi, MTD, Yard Man, and Troy-Bilt. This part sold individually.