Master Wrench sold by Ontel Products claims this specially designed tool can remove any stripped nut or bolt in just seconds. They tout it’s perfect for bolts of all sizes, does the job of 50 different tools, and is perfect for everyone from mechanics to DIY’ers.

How Master Wrench Works

Master Wrench has grips on either end and claims to work on nuts or bolts from 9mm to 36mm. They claim what makes Master Wrench special from other wrenches is its spring-loaded jaws which adjust automatically to the right size and keep it tight like a pit-bull around the nut. 

Also unlike other wrenches, they claim Master Wrench won’t slip or damage your bolts. And if it’s already stripped, they claim it’s no problem – they promise Master Wrench will loosen it with just a twist of the wrist.

Master Wrench Cost:

$37.94 ($29.99 plus $7.95 S&H). Master Wrench comes with a 60-day money back guarantee, minus S&H.

Master Wrench comes with a 60-day money back guarantee (minus S&H) as well as a Lifetime Replacement Warranty. Customer service stated that you must pay to ship Master Wrench back, but they will replace it at any time for no additional charge.

Bottom Line: Is Master Wrench a Scam?

For those folks that have stuck bolts, Master Wrench seems like a very promising product, especially because of its Lifetime Guarantee. We couldn’t find any consumer reviews about Master Wrench, nor any mention of it in professional mechanics’ threads

Ontel Products currently has an A- rating from the BBB. The company has had over 100 complaints about products in the last 3 years but only 4 about warranty issues and the BBB says these have all been satisfactorily resolved (as of March 2015).

We’d just like to make you aware that if you do purchase Master Wrench from their website, you are agreeing to their Privacy Policy, which allow them to use your personal information to solicit you about other products or services. They may also give this information to third parties to do the same. (You may opt-out of these by sending an email to or filling out a form.)

If you want to avoid this, we suggest looking for Master Wrench in your local retailer’s “As Seen On TV” section where this product will surely end up. That way, you can see for yourself how durable it is, avoid any shipping fees, and not worry about any future solicitations. 

You may also want to read this article: How To Remove a Stubborn Nut/Bolt (Instructables)

Let us know what you think of Master Wrench below!