Key Locking Thread Insert System of Measurement Metric Insert Diameter 16 mm Overall Length 16 mm Internal Thread Size M12-1.25 Internal Thread Fit 6H External Thread Size M16-1.50 External Thread Fit 6G Thread Direction Right Hand Thread Type Fine Material Steel Finish Black Phosphate Wall Type Thin Wall Number of Locking Keys 4 Compatible Material Metal Compatible Tap Size M16-1.50 Drill Bit Size 14.75 mm Minimum Installation Depth 17 1/2 mm Maximum Hole Diameter 374.65 mm