Allen Key Handle

thingiverse

This is a versatile grip that fits every Allen wrench you own. The file is designed for use with 1mm size keys, but if you need a grip for a 3mm key, simply scale it up three times. The key can be easily secured and removed from the handle with a single click. It can be installed on either side of the key, regardless of its length or width. You can keep all your grips organized on a ring in your toolbox.