Park Tool TWB-36 Crow Foot The Park Tool TWB-36 Crow Foot is a crow foot style wrench used with any 3/8" drive torque wrench and drive tools with 36mm wrench flats such as Park Tool LRT-2, LRT-3, LRT-4 and BBT-18 to verify components are torqued to the correct specification, so no more worrying about whether or not specific parts on your bike are under or over tightened. Constructed from heat treated 4130 laser cut steel and plated for long life. Specificationsconstruction: 4130 laser cut steelcompatible withwith any 3/8" drive torque wrench and drive tools with 36mm wrench flats such as Park Tool LRT-2, LRT-3, LRT-4 and BBT-18Manufacturer's Part No: BBT-18 | Park Tool | Twb-36 Crow Foot 3/8" Drive