I bought a set of the 30-45-60 degree cutters a couple years ago but dulled them opening my buddies Edelbrock heads from 2.02 valves to 2.08 valve by hand. I wasn’t even smart enough to use my motor drive system that I had pack away in my closet. I won’t beat up this set. They only cost around 110.00 for seven cutters but I hate wasting money.
