Ayp OEM Replacement Blade 340-222
Relaces/Fits 173920/180054 
Requires 3 for 48'' deck; hi-lift blade 
Length 16 3/4'' (425.2mm) 
Centre Holde 5 pt. star 
Width 2 1/2'' (63.5mm)
Thickeness .203'' (5.2mm)