SET OF THREE OREGON Blades 596354 is 17", .805 (13/16") Round center hole. Made in USA. Tungsten carbide is "fused" into the blade - creating an ultra-hard layer at the cutting edge and increasing the time between sharpening. The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge. Replacement blade for John Deere : M127500, M127673, M145476. Fits John Deere models: 717E, 7H17, GX255, GX235, GX335, GX345, GX355, LT166, LT180, LT190, LX280, LX289, S240, SST18, 18, X300, X304, X310, X320, X324, X350, X354, X360, X370, X380, X384, X390, X394, X500, X520, X534, X540, X570, X580, X584, X590, 54HC, X710, 54HC, 60HC, X730, 48C, X734, 54HC, X738, X739, X750, X754, X758, X940, X948, X949, Z355E, Z355R, Z425, Z435, Z445, Z525E, Z535M, Z540M. This is an Aftermarket part. Thanks for looking!