Thread Repair Kit, Insert Types Included Helical Inserts, Compatible Material Metal, Drill Bit Sizes Included 20.8 mm, Finish Plain, Helical Insert Type Free-Running, Insert Length 30 mm, Insert Material Stainless Steel, Material Grade/Class 18-8, Maximum Hole Diameter 17.294 mm, Number of Inserts 5, Number of Pieces 7, Number of Sizes 1, System of Measurement Metric, Tang Style Tanged, Tap Sizes Included M20-2.50, Thread Direction Right Hand, Thread Size M20-2.50, Thread Type Coarse