- Thin wrenches to fit in tight spaces
- OBW-4 has 10, 11, 12 and 13mm openings to fit centering flats, pivot nuts and lock nuts on many dual pivot and side pull brake calipers
- OBW-3 has a 14mm opening, and the other end fits into the tension springs to rotate a brake on its bolt
- Heat treated, nickel plated steel
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