Tracked shipping
Fully tracked delivery to your door.
- Free shipping on orders $39+
- Dispatched in 1 to 3 business days
- Delivery in about 7 to 15 business days
Buy more, save more
Mix and match any items. Applied automatically at checkout.
Order today, arrives 8 to 18 business days
Tracked shipping from our partner warehouse. Free shipping on orders $49+.
30-day money-back guarantee.
Secure, encrypted checkout.
Tracking number on every order.
Turn thin metal into strong, reusable threaded connections in minutes—without welding or power tools. With M3–M8 compatibility and heavy-duty carbon steel construction, tackle repairs, DIY projects, and fabrication with ease.

Easily create strong, permanent metal threads in thin sheets and pipes with precise manual control and high-strength components.
Tackle nearly any fastening project without needing multiple tools. This comprehensive set includes five interchangeable mandrels covering popular sizes from M3 to M8, plus 50 matching rivet nuts. It’s the ultimate "grab-and-go" solution for automotive repairs, furniture assembly, and custom fabrication.

The tool crafted from high-strength carbon steel, Nuts crafted from color-plated zinc, they are built to withstand repeated heavy use without stripping or bending. The manual operation gives you direct tactile feedback, ensuring a secure, clean installation every time without the risk of over-tightening often associated with power tools.

Perfect for creating load-bearing threads in materials too thin to tap, across automotive, construction, aviation, and marine applications.

| M3, M4, M5, M6, M8 |
| High-Strength Carbon Steel and color-plated zinc |
| Manual (Wrench or Hand Tool Operated) |
| 5x Mandrels, 50x Rivet Nuts (10 per size) |
| Metal sheets, pipes, automotive panels, furniture |
This allows for greater precision and control during installation.
They are ideal for thin materials where tapping a thread is not possible, such as sheet metal (steel, aluminum), plastic panels, and fiberglass pipes.
Yes, the mandrels are constructed from high-strength carbon steel, designed to resist wear and provide long-lasting performance even under heavy manual use.
🔥Limited time!🔥Once the offer ends, we will bring the price back up to the original price!

✉️ 24/7 Customer Support: We have a team of live reps ready to help and answer any questions you have within a 24-hour time frame, 7 days a week.
🔒 Safe & Secure Checkouts: We use state-of-the-art SSL Secure encryption to keep your personal and financial information 100% protected.
OUR GUARANTEE
🏺We take pride in our products as we believe they are amazing. However, we understand that buying things online can be daunting, especially for the first time, so we offer a 100% satisfaction guarantee.
💎If you don't have a positive experience for any reason, we will do whatever it takes to make sure you are 100% satisfied with your purchase.

Processed in 1 to 3 business days, then 7 to 15 business days in transit to the United States. Every order gets a tracking number by email. Free shipping on orders of $49 or more; $8.95 in the US or $11.95 elsewhere below that.
Not right? You have 30 days from delivery to request a return. Items should be unused and in their original packaging. Damaged or wrong items are replaced or refunded in full. Email support@caldrene.com to start. Read the return policy.
Exact sizes and options are listed in the description and photos above. We only publish measurements the maker provides. Unsure which option fits? Email support@caldrene.com and a person will help.
Real people answer every email within 24 hours, 7 days a week: support@caldrene.com.
This item ships from our overseas warehouse. We process orders in 1 to 3 business days and delivery takes 7 to 15 business days after dispatch. You get a tracking number by email as soon as it ships.
We email you a tracking number as soon as your order ships. Tracking can take 24 to 48 hours to show its first scan. You can also follow your order in the Shop app.
Yes, within 12 hours of ordering. Email support@caldrene.com with your order number and what you would like to change, and we will sort it before the order ships.
You have 30 days from delivery to request a return on unused items in their original packaging. Damaged, faulty or wrong items are replaced or refunded in full. Email us with your order number and a photo and we will take it from there.
Yes. Checkout is handled by Shopify with SSL encryption and supports Shop Pay, Apple Pay, Google Pay, PayPal and all major cards. We never see or store your card details.
Every order is protected end to end, from checkout to your door.
Fully tracked delivery to your door.
Love it or your money back, no stress.
Checkout protected by bank-grade security.
Every piece earned its place by being bought again and again.
Try it risk-free for 30 days. If you are not completely happy, email support@caldrene.com for a full refund or a free replacement. No hassle, no fine print.
Recently viewed