This is a A-15060SW Bolt, Rotary Cutter Blade PN: 15060SWMain Description As Following : A-15060SW Bolt, Rotary Cutter Blade P.N: 15060SW Flat Spot on Neck/ BoltBolt Diameter: 1.118"Head Diameter: 2.45"Neck Diameter: 1.245"Overall Length: 3.78"Shoulder Diameter: 1.50"Shoulder Length: 1.115"Thread Length: 1.53" Replaces: 125913 SIDEWINDER , Crossed From: 15060-01 , Found in Section & Models : Hay Tool Parts > Rotary Cutter Blade Bolts & Nuts, Sidewinder ROTARY CUTTER: SEVERAL Associated Items : New Also This is An Aftermarket Product And : Flat Spot on Neck/ Bolt Bolt Diameter: 1.118" Head Diameter: 2.45" Neck Diameter: 1.245" Overall Length: 3.78" Shoulder Diameter: 1.50" Shoulder Length: 1.115" Thread Length: 1.53"