Have minimum stength of 3000 psi. a Be level to within 1/8 in. in a 6 n. or 3/16 in. in a 10 n. no...
1
Have minimum stength of 3000 psi. a Be level to within 1/8 in. in a 6 n. or 3/16 in. in a 10 n. no bumps or low spob can be removed by grinding; depressions can be filled with patching
