Thread Repair Kit Insert Types Included Helical Inserts Compatible Material Metal Finish Plain Helical Insert Type Free-Running Insert Length 4 1/16 in Insert Material Stainless Steel Number of Inserts 4 Number of Pieces 2 Number of Sizes 1 System of Measurement Inch Thread Size 3 1/4 In.-8 Thread Type 8 UN Manufacturer Location Made in USA Includes Insert Tap Tool