Inside Diameter 0.127 inches minimum and 0.129 inches maximum Counterbore Diameter 0.485 inches minimum Counterbore Depth 0.026 inches minimum Setscrew Hole Quantity 2 Distance from Hole Center to Knob/Skirt Base 0.187 inches maximum Overall Depth 0.405 inches minimum Gripping Surface Condition Grip aid Shaft Accommodation Style Counterbored Outside Diameter 0.690 inches minimum and 0.730 inches maximum Attachment Method Setscrews Overall Thickness 0.580 inches minimum and 0.640 inches maximum Material Transparency Opaque Screw Drive Type Hexagon socket Thread Quantity per Inch 40 screw hole Nominal Thread Size 0.112 inches screw hole Color Black, lusterless Style Designator Round Thread Series Designator Unc screw hole