Common replacement blade on mowers from: Bobcat, Ferris, Giant Vac, Great Dane, Scag, Snapper and Wright Stander. See original part number cross reference below. 

Length: 21"
Center Hole: 5/8"
Width: 2.5"
Thickness: 0.203"
Air Lift: 1-1/4"

BOBCAT: 42180B, WM142180B
FERRIS: 20842, 20842s, 481712, 5020842, 5020842s, A48304
GIANT VAC: 21538, 3021538
GREAT DANE: D18036, GDU10232
HUSQVARNA: 539101733, 539105711
HUSTLER: 795252
KEES: 101733
LASTEC: P-128, P128, P-322, P322
LESCO: 50170, 5070
SCAG: 481708, 481712, 482879
SNAPPER: 17081, 7017081, 7075770, 7075770BMA, 7075770BZ, 7075770YP, 75770
WRIGHT STANDER: 71440003, 71440010