Thread Repair Kit, Insert Types Included Helical Inserts, Compatible Material Metal, Drill Bit Sizes Included 13 mm, Finish Plain, Helical Insert Type Free-Running, Insert Length 3/4 in, Insert Material Stainless Steel, Material Grade/Class 18-8, Maximum Hole Diameter 0.4459 in, Number of Inserts 10, Number of Pieces 14, Number of Sizes 1, System of Measurement Inch, Tang Style Tanged, Tap Sizes Included 1/2 In.-20, Thread Direction Right Hand, Thread Size 1/2 In.-20, Thread Type Fine