Honda OEM Replacement Blade 325-001
FITS MODELS: HR215 and HR216 with 21'' deck
Medium -lift blade 
Length 20 3/4'' (527mm)
Centre Hole 13/16'' (20.6mm)
Outer Hole 3/8'' (9.5mm)
Centre 3 7/16'' (87.3mm)
Width 2 1/4'' (57.2mm)
Thickness .149'' (3.9mm)