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 1/2 in 3/4 in 1 in Insert Material Stainless Steel Material Grade/Class 18-8 Maximum Hole Diameter Not Applicable Number of Inserts 18 Number of Pieces 22 Number of Sizes 3 System of Measurement Inch Tang Style Tanged Tap Sizes Included 1/2 In.-20 Thread Direction Right Hand Thread Size 1/2 In.-20