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Product description 1 DRILL 2 COUNTERBORE 3 TAP 4 INSTALL 1 ENGINE BLOCKS 2 TRANSMISSION HOUSINGS 3 MOTORCYCLE CRANKCASES 4 SPARK PLUG PORTS
What extra supplies do I need to complete the repair?
The kit includes all essential tools. A tap wrench is not included.For best results, we recommend cutting fluid and thread-locking adhesive.
The tap in the kit is a different size than the bolt I’m repairing. Did I receive the wrong size?
This is a solid insert system (not wire coils). The tap matches the insert\'s external threads, requiring a larger hole. Once installed, the internal thread fits your original bolt perfectly. Not a mistake—just a heavy-duty solid-wall design.
What materials can this repair?
This kit repairs stripped threads in aluminum, cast iron, steel and most machinable metals – ideal for engine blocks, automotive parts and metal frames.
How is this thread repair different from a traditional Helicoil?
Kolvoii uses a solid stainless steel insert (not a wire coil). It requires drilling, counterboring, tapping, and installation — creating a stronger repair for high-stress or frequent disassembly. Solid inserts won\'t unwind or back out over time.
Is this safe to use on aluminum engine blocks or oil pans?
Yes. The stainless steel insert makes the repair stronger than the original aluminum threads. Ideal for high‑torque, high‑heat areas like cylinder heads, spark plug holes, oil pan drains, and transmission casings.
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SHIPPINGWe are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control.We offer free shipping to the lower 48 states and ship within 2 business days of payment, usually sooner. We do not accept P.O. Boxes. Please provide a physical address.For shipping outside of the continental USA, we only use 's Global Shipping Program.The item is shipped to KY and then sent to the rest of the world. International customers are responsible for all duties and taxes. Continue to check out in order to calculate costs for shipping the item to your country. Messages regarding 's Global Shipping Program MUST be directed at EXCLUSIVELY.
RETURNSWe offer a 30-Day Return Policy on items which you are not completely satisfied with. You have the option for a full-refund or an exchange of the item. No returns are available on items shipped outside of the USA.
PAYMENTWe accept PayPal.
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