ITEM NAME:Professional Re Thread Tap Set M10 M12 M14 M18 Description: For Spark plug thread insert tap repair tools. Made of hardened carbon steel, these accessories are of strong strength and long durability. A nice tool kit for repair damaged for spark plug installing threads. Easy to use and operate. Specifications: Material: Carbon Steel Color: black. Small tap size: M10*1.0 / M12*1.25 Big tap size: M14*1.5 / M18*1.5 Package Includes: 2 * for Spark Plug Re-thread Taps Notes: 1. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. 2. Please allow slight dimension difference due to different manual measurement..Big tap size: M14 1.5 / M18 1.5. Small tap size: M10 1.0 / M12 1.25. For Spark plug thread insert tap repair tools. Made of hardened carbon steel, these accessories are of strong strength and long durability.