MaxPower 561812B includes (3) 3-N-1 blades for many 48 in. John Deere Lawnmower These blades replace OEM numbers AM137757, AM141035, GX21784 and GY20852. Each blade measures 17 inches. L and 2-3/4" W with 7-point star bore. Check your instruction manual (may not be in English). to ensure the OEM number of the wiper blade to be replaced matches one of the OEM numbers for this item. MAXPOWER blades are manufactured to meet or exceed OEM specifications. Made in the USA.