This Erbauer masonry drill bit set comes with 10 pieces and can be used with brick and concrete block Includes - 3 mm, 4.5 mm, 6 mm x 100 mm, 6 mm x 150 mm, 7 mm, 8 mm x 120 mm, 8 mm x 150 mm, 10 mm and 12 mm bits Chisel-shaped tungsten carbide tip for ease of drilling into concrete and stone