Pedros 40mm Headset Wrench. Having the right tool for the job is essential when working on bicycles. Pedros flat wrenches provide professional quality precision fit wrenches required to properly install remove and adjust components. Pedros headset flat wrenches are made from 3.2mm thick precision laser cut heat-treated tool steel for the ultimate in strength and lasting performance. Pedros designed each flat wrench to fit perfectly protecting the component and ensuring simple and safe usage for the mechanic. Each flat wrench also features an ergonomic single-ended design with cushioned grip to provide maximum leverage & comfort. . Backed by Pedros lifetime warranty.