The Select Cut Multi-blade Cutting System is equipped with three, interchangeable lower blades; the 3707130003 Mulching Blade, 3707494002 High Lift Bagging Blade and 3707066004 Extended Runtime Blade. The Mulching Blade is ideal for weekly mulching, giving you the mulching quality you would expected from a high-end gas lawn mower. The High Lift Bagging Blade provides extra suction ideal for bagging, leaving your yard free of clippings. The Extended Runtime Blade provides an optimal balance of cut quality and runtime for all around performance. All three blades can be used interchangeably based on your desired cut. The EGO Upper Blade is used in combination with the lower blade chosen to slice the grass into fine fragments; this greatly enhances cutting performance with all grass types. Nuts (5630351001) and Bolts (5640226001) not included. These lower blades are the blades from AB2100D, AB2101D, and AB2102D Blade Sets. For use with EGO POWER+ 56V Select Cut Mowers LM2130, LM2133, LM2130SP, LM2135SP, LM2150SP, and LM2156SP models