Thread Repair Kit for Glow Plugs - M12 x 1.25 Taps and coil inserts for repairing M12 glow plug threads. 5 x 12mm Deep Inserts 5 x 19mm Deep Inserts 5 x 26mm Deep Inserts with black phosphate finish. Essential kit that solves common problems on diesel engine alloy cylinder heads. Rectifies cross-threading and over tightening. This kit ensures a straight thread and the new insert provides an efficient fit.
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