Sonic Pro Tool Blue

The Sonic Pro Tool Blue is an award winning tool that is a bearing pusher, a bearing aligner, some Allen keys and a Phillips screwdriver in one tool.

In fact it is seven tools in one:
1) an Allen key (4 mm hex) for most wheel axes and many frame screws
2) an Allen key (5/32" hex) that is somewhat a variance on the 4mm Allen key (5/32 inch is equal to 3.97 mm)
3) 4) two bearing and/or spacers pushers; the first bearing/spacer pushers removes the (6mm) spacer plus one bearing and the second bearing pusher removes the second, remaining bearing.
5) a floating spacer aligner. A floating spacer aligner is necessary/useful when you have difficulties to insert the axis in a wheel because the (8mm) spacer is floating and as such has to be aligned.
6) a bearing extractor
7) a Phillips #2 screwdriver for many inline skate screws

Fun fact: this tool is in the permanent collection of the Museum of Modern Art in New York.