The Universal Support Bolt is the perfect solution for attaching bike accessories in versatile locations. Use it to mount a cage where there’s no braze-on or insufficient mounting points. It also works great as an additional support bolt for the Many Thing Cage. The sizing accommodates the maximum diameter for secure installation. Sizing Options: 1 1/8-inch: For handlebars, seat stays, etc. (minimum diameter: 3/4 inch) 1 3/8-inch: For steel frames and forks 1 5/8-inch: For 32mm suspension forks 2-inch: For aluminum tube bikes, 36mm suspension forks, and similar setups It is recommended to use electrical tape or a cloth rim strip to protect the frame or fork legs. Avoid rubber inner tubes, as they can cause clamp breakage. Be sure to tighten the clamp after use. Nut Size : Metric M5 Width of metal strap : 8mm or 5/16"