This is a quality rear engine cover that is used on several types of string trimmers. The component is tightened onto the back of the trimer to offer protection and shielding to the engine. It is made of a durable material and comes with both the cover and four screws to attach it to a string trimmer. Over time, the rear engine cover can become damaged, broken, or lost and should be replaced to ensure the engine is protected.Check the rear engine cover for cracks and other damage before installing a new replacement part. First, remove the screws from the rear engine cover so it can be taken off of the string trimmer. An O-ring may be needed to create the proper clearance when installing the new rear engine cover. Make sure to properly tighten the screws on the cover before use.This rear engine cover is an authentic OEM replacement part that is sourced directly from the manufacturer. It is sold as an individual component. The engine cover is designed to be compatible with string trimmers manufactured by Bolens, MTD, Yard Machines, Murray, and Craftsman.