Feature●3/8-16 Starter bolt thread repair kit cast iron blocks or aluminum blocks P/n 1535 TIME-SERT●TIME-SERT P/n 1535 Kit includes all the tools and 4 special inserts with straight section for bolt alignment built into the insert.●The stripped Starter bolt thread depth of the hole should be 1.200" inches or 30mm Depth minimum.●Note: This kit can also repair a failed coil style insert. The failed hole should not be larger than the drill included in kit which is .484 inches.Description 3/8-16 Starter bolt thread repair kit cast iron blocks or aluminum blocks P/n 1535 TIME-SERT. TIME-SERT P/n 1535 Kit includes all the tools and 4 inserts. The stripped Starter bolt thread depth of the hole should be 1.200" inches or 30mm Depth minimum. Note: This kit can also repair a failed coil style insert. The failed hole should not be larger than the drill included in kit which is .484 inches. Extra insert p/n 153501