Used with small radius at end, Huron 10" Chuck serrated 1/16" x 60 deg, soft jaws for standard serrated chucks such as Powerhold, Autoblock, Erickson, GAMET, Rohm, Bergman, Schunk. M/N 11PSH. Steel Jaws. Dimensions: Groove .788, Bolt CL 1.187", 1/2" screws, 4.75 long, 1.75" wide, 2.0"H. New @ $39.70 each.