MaxPower's 561811XCPB includes 4 mulching and cutting combo blades for many 42 in. John Deere riding mowers. Which includes 2 commercial mulching blades for premium mulching performance and two 3-N-1 style replacement blades. These blades replaces John Deere OEM #'s GY20850 and GX22151. Fits models D100, D105, D110, D120, D125, D130, E100, E110, E120, LA105, LA115, LA125, LA135, LA100, LA110, LA120 and others. 2 mulching blades measuring 21-3/8 in. L and 2-1/2 in. W. 2 blades measuring 21-3/8 in. L and 2-3/4 in. W. All blades have a 7 point star center hole. For use on models with serrated center hole mounting system. Check your owner's manual to verify that the OEM number of the blade being replaced matches one of the OEM numbers provided for this item. Maxpower blades are manufactured to meet or exceed OEM specifications.