I've used these washers on everything I can since I bought them. You'll make these cuts a little easier if you expand your tools, especially if the material eventually breaks and your hand takes a hit. In the short time I've had a needle nose, they made cautery pins a breeze, especially when entering through a narrow opening to bend the pins. Unfortunately a dipstick where I work ripped it out of my box when I turned around and ended up walking over it. They would have been fine but it was D8 and then the guy left them in the elements for a week. Gearwrench can guarantee it, but the tool wagons I've spoken to so far won't. Would buy again, great tool and much lighter in hand