For allen keys do not use the free ones that come with flat-pack furniture, they are next to useless and made of cheese, buy a proper set of chrome-vanadium steel 'L' shaped ones (metric sizes only for cycles unless you are in America) and do not lend them out ever. Multi tools have their uses for roadside repairs but for home use buy the tools as and when you need them and don't expect bargain stuff to last as long as quality kit.