Made of 6061 aluminium alloy, dont have much tiny parts which easily get missing. While most fork mount only have screw holes at one side, we have holes for both side, its much secure than fix at one side when screwed to a wood or iron bar. The outer diameter of this mount is 0.79 inch, right fit with your bikes drop out, once the axle/skewer was locked up, it wont getting loose in your trip. You dont need to worry that your bike may falling off. We have 2 different size of T slot nut, you can easily install it on to a thule/yakima or other well-know brand roof rack cross bars. Versatile installation choice. This fork mount could been installed on a car roof cross bar/ trunk bed/ wood bar. You can always find somewhere to install it with convenient.