Ayp OEM Replacement Blade 345-070
Replaces/Fits 1726453/1726453A
Requires 3 for 50'' deck medium-lift blade 
Lenght 18 3/16'' (462mm)
Centre Hole 3/4'' (19mm)
Outer Hole 3/8'' (9.5mm) 
Centre 2 9/16'' (65.1mm)
Width 2'' (50.8mm)
Thickness .203'' (5.2mm)