Usage Tips:Feature: 1. PROFESSIONAL AND UNIVERSAL: This is a professional universal reamer cylinder spark plug thread repair tool, and which is a comprehensive kit 2. FOR ENGINES AND GENERATORS: Can make your maintenance work easier, effective and convenient, especially suitable for gasoline engines, generators, diesel engines and other machines 3. QUICKLY AND EFFECTIVELY REPAIR: This is a very practical and efficient spark plug thread repair tool set, designed to help quickly and effectively repair damaged spark plug threads and prolong the service life 4. USEFUL AND CONVENIENT: Universal size is suitable for repairing spark plug thread M10x1.0, very useful and convenient 5. GOOD QUALITY STAINLESS STEEL MATERIAL: Good quality stainless steel material and galvanizing process ensure that the products you buy are durable Specification: Item Type: Spark Plug Thread Repair Tool Threaded Pipe Size: M10x1.0 (thread diameter x pitch) Threaded Pipe Length: Approx. 17.5mm / 0.69in, 12.5mm / 0.49in(Each 5pcs)Threaded Pipe Material: Stainless steel Tap Size: M12x1.0 (thread diameter x pitch) Tap Material: High speed steel. Package List: 1 x M12x1.0 Tap10 x M10x1.0 Threaded Pipe