Features Double end valve wheel wrenches grip the rims of valve handwheels for secure leverage to open and close the valve. They reduce the amount of force needed to open or close valves that have a handwheel. Head Size/ 1/2 inch; 21/32 inch Material / Alloy Steel Finish / Black Oxide Overall Length / 8 inch Non-Magnetic / No Non sparking / No Corrosion Resistant / Yes Insulated / No