Pedros 20mm Cone Wrench II. The cone wrench is an essential tool in bicycle mechanics simply being the only tool available for adjusting many hubs on the market. Pedros cone wrenches provide professional quality precision fit wrenches required to properly install remove and adjust hubs. Pedros cone wrenches are made from 2mm thick precision laser cut heat-treated tool steel for the ultimate in strength and lasting performance. Pedros designed each cone wrench to fit perfectly protecting the hub and ensuring simple and safe usage for the mechanic. Each flat wrench also features a single-ended design with ergonomic cushioned grip to provide maximum leverage & comfort. Backed by Pedros lifetime warranty.