Original Bolt on posthole Differ Auger point Fish Tail Fish Tail Auger Point for more aggressive job on clay soil. Overall height: 6 5/16″ Insert portion diameter: 1.97″ (Shaft portion) Insert portion length: 2″ Mounting hole diameter: 0.56” 1.18″ from the center of the hole to the flat part of the round partThe widest dimension is 3.61″ JD # 5BP503928BOEM # 503-928B MPN 19-278