●[Specifications and packaging]: 110pcs wire thread inserts: 25xM5, 25xM6, 25xM8, 25xM10, 10xM12. 5pcs twist drill bits, 5pcs break pin tools, 5pcs installation tools, 5pcs taps, 1pc hex key. ●[Function]: The metric thread repair kit can be used to repair damaged or stripped internal threads in automobiles and engines. ●[Material]: The installation tools take classic high speed steel construction,which is robust and this special design can provide an efficient thread repair job.Whats more,the inserts are heat-treated 45#steel which possess greater strength and longer service life. ●[Advantage]:The helicoil kit takes the most commonly used metric size bits and match the installation job.This has good maneuverability and can help you get the job done quickly. ●[Quick Replacement, Safe Installation]: All components are packaged in a steel carrying case for quick and easy storage and removal.