Thread Repair Kit Insert Types Included Helical Inserts Compatible Material Metal Drill Bit Sizes Included 17/32 in 17/64 in 21/32 in 21/64 in 25/64 in 29/64 in Finish Plain Helical Insert Type Free-Running Insert Length 3/8 in 15/32 in 9/16 in 21/32 in 3/4 in 15/16 in Insert Material Stainless Steel Material Grade/Class 18-8 Number of Inserts 78 Number of Pieces 82 Number of Sizes 6 System of Measurement Inch Tang Style Tanged