Description Park Tool double-ended cone wrenches are designed for the home mechanic or occasional user. Made of thin steel and nickel plated and heat treated for a lifetime of use, with a conveniently small size to fit into any tool box. The Park Tool Cone Wrench 17/18mm DCW-3 is great tool to keep on hand for emergency repairs at home. 17mm on one end, 18mm on the other Hub cone wrench Park Tool – that means it’s good for heavy duty use like in a bike shop!