Replaces OEM part numbers: Ariens 21547175, 21547174 Compatible with: Ariens 936037, 936046, 936047, 936060, 936061, 936064, 936070, 936079, 936080, 936087, 936091, 936092 42″ Deck Tractors Compatible with: Ariens 936007, 936038, 936041, 936042, 936045, 936048, 936049, 936051, 936052, 936065 42″ Hydro Tractor Compatible with: Ariens 936065, 936073, 936074, 936076, 936083, 936084 42″ Automatic Tractor Blade Specifications: Length 21 1/8″; Width 2 1/4″; Thickness 0.157″; Center Hole – Five Pointed Star