At the heart of the Bar Fly TT is 1/8th turn technology & it’s the center point of our new mounting system. The 1/8th turn mechanism is a patent pending positive engagement system that enables cross compatibility with all Garmin Edge series cycling computers, & the Garmin Forerunner 910 XT & 310 XT watches. Made in the USA out of Delrin with no screws to lose, Bar Fly TT is the only mount that positions all of your Garmin devices directly in the center of the handlebar in a safe & aesthetic viewing position. Plastic on Plastic design Garmin computers are made from Plastic & so is the Bar Fly. We chose Delrin, the highest quality plastic, because it is the most appropriate material for this key interface. Hard materials such as aluminum have been found to "eat away, & shave off, material that can permanently damage your Garmin computer. With Bar Fly products there is always Zero Risk of over-tightening Carbon handlebar safe.