Standard Pack = 1 piece(s). Center Diameter = 0.63 IN ; Clamping Diameter = 1.26 IN ; Height = 1.181 IN ; Inside Diameter = 0.689 IN ; Nose = 0.394 IN ; Series = 680-21 ; Size = 6 x 3.2 mm ; Turning Diameter = 1.299 - 2.520 IN ; Type = Left Hand Rotation Driving Disc ;