Abbott Workholding Products (3 Piece Set of Jaws) KTT12S4 Style P Steel Lathe Chuck Jaws with Fine Metric Serration. 18mm Groove, 14mm Fastener. Jaw End Shape: Pointed. 12" Chuck Capacity. 1.5mm x 60° Serrated Attachment. 3 Square Soft Lathe Chuck Jaws. 1018 Cold Rolled Steel. 30 mm Distance Between Mount Hole Centers. 5-1/2" Long x 2" Wide x 4" High.