Park Tool OBW-4 Offset Brake Wrench The Park Tool OBW-4 Offset Brake Wrench features a unique design that was specifically made to be used in tight spaces. It features 10, 11, 12 and 13mm openings that were made to fit and adjust many models of side pull and dual pivot brakes. It's a very useful tool to carry in your arsenal. Features 10, 11, 12, and 13mm openings Related Articles: SIDE PULL BRAKE SERVICE Manufacturer's Part No: OBW-4 UPC: 763477004840 | Park Tool | Obw-4 Offset Brake Wrench | Silver | 10Mm, 11Mm, 12Mm, & 13Mm