Park Tool 3-Way Socket Wrench - ST-3 $12.49
Trust the original.
The three most common bolt and nut sizes are 8mm, 9mm, and 10mm. Park Tool, being the savvy purveyor of bicycle repair equipment that it is, puts these three sizes together in one tool -- the 3-Way Socket Wrench.
Known internally at Park Tool as the ST-3, and to mechanics worldwide as a Y-wrench, this three-way has 8, 9, and 10mm socket wrenches. By having three sizes instantly available, you'll spend less time fumbling around, and more time fixing things.
What community has to say
Almost more useful than the 3-way hex
- Familiarity: I've used it several times
Since few people are really good at telling what size socket is needed, this reduces fuss and stuff works in most cases, given that wrenches are often singles. Not quite enough torque for some applications, but if you put stuff back together right everything should be doable with this triple set.