Thread Repair Kit Insert Types Included Helical Inserts Compatible Material Metal Drill Bit Sizes Included 33/64 in Finish Plain Helical Insert Type Free-Running Insert Length 3/8 in Insert Material Stainless Steel Material Grade/Class 18-8 Maximum Hole Diameter 0.623 in Number of Inserts 10 Number of Pieces 12 Number of Sizes 1 System of Measurement Inch Tang Style Tanged Tap Sizes Included 1/4 In.-18 Thread Direction Right Hand Thread Size 1/4 In.-18 Thread Type NPT