Pitman Arm Steering Pitman Arm Castle Nut Included:Yes Center Link End Attachment Diameter:5/8 In. Color:Black End 1 Attachment Type:Spline End 2 Attachment Type:Taper Finish:Coated Length:136.4 mm Lubrication Type:Greasable Material:Steel Mounting Hardware Included:Yes Package Contents:Pitman Arm, Castle Nut, Cotter Pin, Zerk Fitting Spline Quantity:40 Steering Shaft Diameter:25.6 mm