* Industrial Grade, Heat * treated Chrome Vanadium Steel. * All Sets with Steel Storage Cases. * Same Sizes 7 Paces 1/4" Dr: 1/4, 9/32, 5/16, 11/32, 3/8, 7/16 & 1/2". * 9 Paces 1/4" Dr Deep: 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16 & 1/2". Metric Sizes: 9 Paces 1