Time-Sert 0381D 3/8-16 Inch Motorcycle Head Bolt Thread Repair Kit Where The Depth Of Hole Is 1.250 Deep. Time Sert Thread Repair Kits Are Approved By Leading Automotive Manufactures. Time-Sert Easily Repairs Stripped Threads In Cylinder Head Bolts, Spark Plug Holes And Oil Drain Pans As Well. Many Thread Repair Kits Are Available For Your Threaded Bushing Application In Metric And American Sizes. Time-Sert Is The Very Best In Thread Repair!