EASY TO USE - Just tighten the tool slightly on the good threads, and then back off over the damaged thread area to restore the threads. MIKODA 7402 Universal External Thread Repair Tool Kit, Outside Thread Chaser Thread Chaser Tool NONY Metric Dies Set Similar To OTC 202817 For 7402 Universal Outside Thread Chaser Heavy Duty Steel Black (3Pcs/Set) - 34 Thread Restoration Tool INCLUDES standard die set - No.OTC216884 (six dies - 4,5,6,7,7-1/2,8,9,10,11,11-1/2,12,14,16,18,20 and 24 threads per inch) Metric size dies available - No.202817 (six dies with metric pitches - 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0mm ) - Must be purchased separately FUNCTION - This thread chaser will quickly restore threads to near original condition without the use of expensive thread-cutting equipment. OTC-7402 OTC Universal Outside Thread Chaser International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.