The High-Lift Bagging Blade is great when you need extra suction ideal for bagging, leaving your yard free of grass clippings. The lower, High-Lift Bagging Lower blade is interchangeable with the Mulching Blade and the Extended Run Time Blade. The Upper Blade is the 2nd blade of the multi-blade system and is included in this set. This blade slices the grass the lower blade sucks up to enhance the cutting performance. This all steel blade is specifically designed for all EGO POWER+ Select Cut™ 21" Lawn Mowers. The EGO Select Cut™ Multi-Blade System is EGOs solution to replacing premium gas lawn mowers for good. EGO parts are designed specifically for your EGO POWER+ Lawn Mower and offer the highest quality, performance and value. (Nuts and bolts not included.)