Very common replacement blade for mowers by Ariens, Bad Boy, Bobcat, Exmark, Ferris, Gravely, Kees, Snapper, Snapper Pro, and Toro. Please verify measurements on your OEM blade or in owners manual. 

Center Hole: 5/8"
Length: 16 1/4"
Center To Center: 1 5/8"
Width: 2 1/2"
Thickness: .250"
Outer Hole: 1/4"

ARIENS Requires 2 for 32" deck; 3 for 48" deck
BAD BOY Requires 2 for 32" deck; 3 for 48" deck
BOBCAT Requires 2 for 32" deck; 3 for 48" deck
EXMARK Requires 2 for 32" deck; 3 for 48" deck