This mount can attach bars that are 20~30mm in diameter.I recommend M3 Socket screws from 10~20mm. I remodeled the casing from a particular designer ghellings and added a bar mount similar to a standard GoPro bar mount. I prefer an infill setting of 50~100% because you will need to the strength for the device to hold up during bicycle rides and such. --- Support 3D Creator --- If you would like to help me create more cool things and remake stuff, or buy me coffee that would fuel my creativity to do so, you can by clicking here .