SET OF 9 RIDING LAWN MOWER REPLACEMENT DECK BLADES. THEY REPLACE PART NUMBERS 539101733, 038-6080-00, 310-078, B1SB3434, 1-7081, 1520842, 5020842, 7017081, 7075770, 7075770BMA, 7075770BZ, 7075770BZYP, 7075770YP, 75770, 7-04793, 50170, 71440003, 91-626, 340-117, 050170, 50170, 50256, 51532, P-246, P-322, 48111, 481708, 481712, 482879, 48304, A48111, A48304, 101733, 112111-03, D18036, GDU10232, 0788,1520842, 1520842S, 823006, 79-117, PC005, PL4207, 112111-03, 112243-03, 42180B, 72039B AND WM142180B. SPECS: LENGTH: 21" CENTER HOLE: 5/8". A 42" DECK REQUIRES TWO BLADES, AND A 61" DECK REQUIRES THREE.