Complete BaerCoil Thread-Repair-Kit Contents: 1 x  HSSG BaerCoil Spark Plug Tap with Pilot Nose (no pre-drilling necessary) 1 x  Inserting Tool + 5 BaerCoil Wire-Thread-Inserts "free running", stainless steel (ASIS 304) length: 8,40mm + 5 BaerCoil Wire-Thread-Inserts "free running", stainless steel (ASIS 304) length: 12,40mm + 5 BaerCoil Wire-Thread-Inserts "free running", stainless steel (ASIS 304) length: 16,40mm
No Tang break tool - for Spark Plug use a longe nose pliers to remove the tang.

BaerCoil instruction for use Technical data - metric BaerCoil wire thread inserts DIN 8140 Drill Sizes Technical Information

BaerCoil: - Thread Repair of damaged or worn-out threads - Recovery of rejected items - Thread Armour Plating. For material with low shear strenght eg. aluminium alloys and magnesium alloys.
Due to narrow and exact tolerances the new thread normally is stronger than the original one. Use in machine-building, electrical, automotive, medical and aerospace industries.