Open package, but never used. Google Faast ABI-200 for more details on this product.
I opened package to discover that despite instructions saying to use 50mm bolts with handguards, the package did not include them. Instead, there was a second pair of 35mm bolts.
Called Faast. They explained that they have a new product that they recommend for use with handguards, where you use a tap to thread the inside of handlebar. If I wanted to use the ones I bought, I could find 50mm bolts.
I was a bit miffed that the options were buy a different product or buy extra parts, but went with their Threaded Anti Vibration Bar Inserts.
If you don't use full-wrap hand guards, bolt these on and go.
If you use full-wrap hand guards but don't expect to test them to the degree I test mine, find 50mm bolts, and use these.
If crashing is part of riding for you, consider the Threaded Anti Vibration Bar Inserts instead.