I have a lot of guitars containing floyd rose trem systems. I always order these wrench keyholders along with them! It is so vital with the floyd rose system to have your allen wrenches nearby your guitar! This allen wrench keyholder does exactly that and is also very durable! Never, ever has there been a situation where an allen key would fall out of this keyholder. I always put them on the back of the headstock of the guitar so nowhere to be seen but always available when you need them! For installing the product, it is very important to pre-drill the two holes! The screws themselves aren't very strong so if you would try to install it without drilling, you'll certainly will tread off the head of the screw causing you a lot of trouble solving that situation. But once installed properly like stated, it operated fine and handy!