SMA 5/8"x18" Chisel Spike - 686-1858716 1858 Series Chisel Points Punched on 2-1/4” - Center for 7/16” Plow Bolt The 1858 and 1878 Series have Upset ( Swedged ) Nose for Increased Wear and Longer Life Even after Considerable Wear - these Spikes Retain their Original Shape and Stay Sharp Specifications ApplicationChisel Plow Bolt Size1/2 Inch Bolt Spacing2-1/4 to 2-1/2 Inch Extended WearNo Length18 Inch Nose StyleSwedged Product TypeStraight Point Thickness7/8 Inch Weight7.4 lbs. Width2 Inch Thanks for looking!