Kolvoii Helicoil Thread Repair Kit 320-Piece — Metric & SAE Set with Stainless Inserts

Kolvoii 320-piece Helicoil Thread Repair Kit is a full SAE and metric thread restoration system that restores and reinforces stripped or damaged threads quickly and reliably.

This all-in-one kit supplies everything needed to repair common thread sizes—both SAE and metric—so you can fix stripped bolts, worn engine threads, and damaged fastener ports without replacing the part. Packed into a durable, organized case, the Kolvoii set includes drill bits, taps, stainless steel wire inserts, installation and break-off tools engineered to guide you through a consistent, three-step repair workflow.

How do I perform a repair with this kit?

Repairs follow a simple Drill → Tap → Install procedure designed for repeatable, clean results. Kolvoii tools are matched to the included insert sizes so you get the correct hole diameter and thread form every time, then install the coil and break off the tang for a ready-to-use thread.

• Use the color-coded drill bit for the correct diameter in the matched size set.
• Tap the hole with the supplied high-quality screw tap to the precise thread pitch.
• Insert stainless helicoil with the installation tool and shear the tang with the break-off tool.

What materials and sizes does the kit cover?

The Kolvoii set works across a wide range of materials and fastener standards, including soft metals where thread reinforcement is most beneficial. It contains both SAE and metric inserts and tooling sized for common automotive and machinery applications.

• Included sizes: 1/4", 5/16", 3/8", 7/16", 1/2" and M5, M6, M8, M10, M12.
• Compatible materials: aluminum, iron, carbon steel, bronze and similar alloys.
• 320 total pieces: inserts, taps, drills, install/break tools, hex wrenches and case.

Why choose Kolvoii coils over a simple retap or oversized bolt?

Helicoil inserts create a new helically wound thread of corrosion-resistant stainless steel, distributing load across a stronger wear-resistant surface. This often results in threads that are more durable than original threads in soft metals, reducing future stripping and extending part life.

• 304 stainless steel inserts resist corrosion and hold fastener torque reliably.
• Heat-treated HSS drill bits and taps perform cleanly in repeated repairs.
• Creates OEM-style threads without enlarging the fastener or component hole permanently.

How portable and organized is the kit for field use?

The kit is built for technicians and hobbyists who need a mobile, ready-to-use solution. Each component has a designated slot in the custom carrying case so you can find the right tool quickly and protect delicate bits and inserts during transport.

• Compact case stores 280 inserts, 10 installation and break-off tools, 10 taps, 10 drill bits, and hex keys.
• Rubber-coated grips improve handling during extended jobs and reduce slippage.
• Lightweight and robust for shop benches, roadside repairs, or field service calls.

Who is this for? The Kolvoii 320-piece Helicoil Thread Repair Kit is ideal for automotive mechanics, industrial maintenance technicians, and DIY enthusiasts who need a reliable, comprehensive thread restoration solution. If you service engines, machinery, or equipment with frequent threaded connections and want a portable kit that restores and strengthens threads to resist future wear, this set delivers professional-level components and a clear repair workflow.