They work great, are very affordable and yet totally reliable without compromising on workmanship. Currently used on S2000, Corvette and Mustang vehicles. Some of my gorilla lock kits are 9 years old and are used on cars parked outside during inclement weather. I like to buy boxes of 24 grommets because you can fit 20 of the same grommets into your machine and have four spares in case of loss or damage.