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Working on frame or fork mounted side pull and dual caliper brakesets can be tricky because space for tools is very limited. Generally you don't require torque, but control. The Park Tool OBW-4 Offset Brake Wrench is a compact, thin steel four tool wrench that slips easily into the tight spaces to control the bolt or nut in question. Once applied you can easily manipulate the caliper position via the center mount post bolt.

The thin offset wrench has 10, 11, 12, and 13mm openings, 2 per end, and yes, the tool faces are offset to each other, hence the OBW-4 designation.