Description TIME-SERT Metric Spark Plug Kit M12 x 1.25 Extended Spark Plug Kit Part # 4212E. The deep hole kit is better suited for holes 6 inches or deeper. The wrench which is the second black tool is 4-5/8 inches long, rotates all the tools. The wrench has a 1/2″ inch hex at the top which can allow you to extend the tooling with a socket further if need. Click here to purchase M12 x 1.25 washer seat inserts. INSTRUCTIONS: CLICK HERE