Heat-treated steel with black oxide finish * 20 pieces of 1/8"; 10 pieces of 5/32", 15 pieces of 3/16"; 25 pieces of 1/4" * 15 pieces of 5/16"; 20 pieces of 3/8"; 15 pieces of 7/16"; 15 pieces of 15/32" * 20 pieces of 7/8"; 15 pieces of 1"; 15 pieces of 1 1/16"; 10 pieces of 1 1/8"; 5 pieces of 1 1/4" * 25 pieces of 1/2"; 15 pieces of 9/16"; 20 pieces of 5/8"; 25 pieces of 3/4"; 15 pieces of 13/16"