Helicoil Thread Repair Kit, Metric M5–M12, 166-Piece

Helicoil thread repair kit restores stripped or damaged metric threads fast, helping you return bolts and fasteners to a secure, reusable fit. This 166-piece rethreading tool kit covers common sizes for automotive repair, machining, and equipment maintenance. Heat-treated HSS drill bits and taps deliver consistent cutting, while stainless steel thread inserts reinforce weak holes for long-lasting repairs. Everything stores in a labeled case for quick selection and clean organization on the job.

• Restores damaged threads in aluminum, iron, carbon steel, bronze, magnesium, and more


• Includes 166 pieces with 145 stainless steel inserts for frequent repairs and refills


• Delivers accurate cutting with heat-treated HSS drills and taps (HRC 50–60)


• Simplifies repairs: drill, tap, install coil, then break tang for a finished thread


• Keeps tools organized in a carry case for fast access at the bench or in the truck

Built for mechanics and DIY users who need reliable thread restoration without hunting for individual tools. With M5, M6, M8, M10, and M12 coverage, this kit matches many metric component specs found in engines, housings, brackets, and machinery. The rubber-coated installation tool helps maintain control during insert placement, reducing slips and rework. Stock it in your workshop for routine maintenance or keep it in your vehicle for on-the-spot fixes—grab yours today and stay ready for the next stripped thread.

• Thread sizes: M5, M6, M8, M10, M12


• Total pieces: 166 (includes 145 thread inserts)


• Drill bits: 5 pcs (5.2 mm, 6.3 mm, 8.3 mm, 10.5 mm, 12.5 mm)


• Taps: 5 pcs (M5x0.8, M6x1.0, M8x1.25, M10x1.5, M12x1.75)


• Tools: 5 installation tools, 5 tang break tools, 1 hex key


• Materials: HSS drill bits/taps; 304 stainless steel inserts


• Hardness (drills/taps): HRC 50–60


• Color: Red & Black


• Storage: Carry case included