Features: Includes 13pcs M14x1.25 thread inserts and one M16x1.25 thread tap, a professional spark Plugs thread repair kit. These threaded inserts are stainless steel, the surfaces is galvanized technology, high hardness, not afraid of wear. The tap is approximately 110.7mm/4.4inch in overall length, and the tap cutter length is approximately 33mm/1.3inch. These inserts and taps have standard threads for repairing 14mmx1.25mm spark Plugs. Efficient and labor-saving tapping, very suitable for Gasolines engines, generators, engines, etc. Specifications: Component:Stainless steel+brass Thread Insert Length: Approx.17.5mm / 0.7in Tap Diameter:Approx.110mm/0.4in Tap Full Length: Approx.110.7mm/4.4in Tap Cutter Length: Approx.33mm/1.3in Package Includes: 12pcs M14 Screw Inserts 1pc M16 Straight Tap note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.