Commstones should be twice as long as the width of the longest flat spot and as long as will work freely between adjacent brush sets.1 in X 1 in X 4 in, Commstone, Grade Ec & F, Double Duty When compared to turning tools commstones are easier to use, more time effective, and remove less copper..
1 in X 1 in X 4 in, Commstone, Grade M & Ep, Double Duty When compared to turning tools commstones are easier to use, more time effective, and remove less copper..