This is a A-3900WD Blade, Rotary Cutter, CCW PN: 3900WDMain Description As Following : A-3900WD Blade, Rotary Cutter, CCW P.N: 3900WD Center Of Hole To End Len: 17.125"Hole Diameter: .875"Offset Height: .750"Overall Length: 18.375"Thickness: .375"Type: CCW twistWidth: 3.000" Replaces: WP3900 JOHN DEERE , 1251501 WOODS MOWER BELTS , 3900 WOODS MOWER BELTS , 3900RCB , A-80A3900 WOODS MOWER BELTS , Crossed From: 3900RCB , Found in Section & Models : Hay Tool Parts > Rotary Cutter Blades, Woods ROTARY CUTTER: B080, Woods ROTARY CUTTER: B80, Woods ROTARY CUTTER: B80U, Woods ROTARY CUTTER: C080, Woods ROTARY CUTTER: C80, Woods ROTARY CUTTER: C80U, Woods ROTARY CUTTER: D08, Woods ROTARY CUTTER: D80, Woods ROTARY CUTTER: K4, Woods ROTARY CUTTER: MB80, Woods ROTARY CUTTER: M80, Woods ROTARY CUTTER: 80 Associated Items : New Also This is An Aftermarket Product And : Center Of Hole To End Len: 17.125" Hole Diameter: .875" Offset Height: .750" Overall Length: 18.375" Thickness: .375" Type: CCW twist Width: 3.000"