Review on KAIFNT K202 Spark Plug Tool Set With Magnetic Swivel And Thin Wall Sockets, 6-Piece, 3/8-Inch Drive For 9/16" And 14Mm Sizes by Tristan Graham

This looked very promising. With the variety of sockets, it has the value of use for many different vehicles & applications. The problem is the retention system is too fragile.I bought this set specifically to change the plugs in my Mazda 3 which requires a 14mm socket. Testing it a couple of times on one of the new plugs, the socket seemed to work fine & hold the plug securely. Other manufacturer's sockets use a rubber grommet or magnet to hold the spark plug in place. KAIFNT uses spring clips on the interior of the socket to hold the spark plug in place during removal & install.I removed all 4 original plugs using the KAIFNT 14mm socket & it worked great. Unfortunately, after the install of the first plug, the socket would no longer retain / hold a spark plug in place. For whatever reason, the spring clips on the 14mm socket were no longer working & it wasn’t obvious what had caused them to fail. For the install of spark plug #2 I dropped it into the hole/recess & then placed the socket over it. While setting #2 in place I realized I could use the 9/16 socket for plugs #3 & #4 & it worked fine for completing the job.I’m frustrated that after being used less than a dozen times the 14mm socket was unable to retain the spark plug. I intend to return & replace with sockets that use a magnet for retention. I spent over 30 minutes trying to find a way to contact KAIFNT, but was unable to find warranty contact information on the packaging, the web, or Revain’s product page. Lesson learned: make sure you can easily find a contact number for any product that advertises having a warranty before purchase. (My apologies if I’ve missed something obvious. I’ll update this review if I learn that’s the case).The sockets & extensions are well made. The locking feature on the extensions are a must have - to some degree I hate to return the set due to the quality of the locking extensions, but can't justify the cost for 2 extensions. There’s no locking function on the universal joint which could cause an issue - (the same issue you’re trying to avoid by using a locking extension to begin with).In short, the spring clip retention system doesn’t deliver (at least not for me) & I would recommend looking at other products.