The crank brothers multi 17 tool whether you39re out for a full days ride or just a couple of hours the multi 17 tool is one thing that you should pack in to your bag if you find that your bike needs tweaking more often then not then the trail bike tool offers a swift and simple solution packed with 17 tools it can accomplish most things you need doing whether it39s adjusting your seat or help sorting out a replacement tyre the multi 17 is made from 6061 t6 aluminium whilst the tool