Heli Coil is the original spark plug port thread repair. These kits offer the highest quality and most durable repair available. Kits are available in sizes M10, M12, M14, M18 and 7/8". Each kit contains a piloted reamer tap (no drilling necessary), and installation tool, and a quantity of inserts. The M12 and M14 kits contain several insert lengths to accommodate all spark plug reaches.
Note: Do
NOT use Heli Coil wire inserts to repair taper seat spark plug ports.
Specifications:- Tap Part No. - 1030-12
- Installation Tool Part No. - 4971-12
Includes 2 Size Inserts
Reach - 1/2"- Insert Package Part No. - R482-1
- Insert Quantity - 6
Reach - 3/4"- Insert Package Part No. - R482-2
- Insert Quantity - 6
Heli Coil 5523-12 Spark Plug Hole Repair Set - Thread Size 12-1.25mm 
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