Key Locking Thread Insert System of Measurement Inch Insert Diameter 9/16 in Overall Length 1/2 in Internal Thread Size 3/8 In.-24 Internal Thread Fit 3B External Thread Size 9/16 In.-12 External Thread Fit 2A Thread Direction Right Hand Thread Type Fine Material Steel Finish Black Phosphate Wall Type Heavy Wall Number of Locking Keys 4 Compatible Material Metal Compatible Tap Size 9/16 In.-12 Drill Bit Size 33/64 in Minimum Installation Depth 9/16 in