Key Locking Thread Insert System of Measurement Inch Insert Diameter 1/2 in Overall Length 1/2 in Internal Thread Size 3/8 In.-16 Internal Thread Fit 3B External Thread Size 1/2 In.-13 External Thread Fit 2A Thread Direction Right Hand Thread Type Coarse Material Steel Finish Black Phosphate Wall Type Thin Wall Number of Locking Keys 4 Compatible Material Metal Compatible Tap Size 1/2 In.-13 Drill Bit Size 29/64 in Minimum Installation Depth 9/16 in