This 12-Piece Super Masonry drill bit set from Mibro - a 60 plus year old company selected as one of Canada's "50 Best Managed Companies" contains two 1/8-Inch, two 5/32-Inch, two 3/16-Inch, three 1/4-Inch, 5/6-Inch, 3/8-Inch and 1/2-Inch masonry drill bits. They have a tough carbide tip for a long service life. All bits 3/16-Inch and larger have 3 flats on the shank to prevent twisting in the drill chuck. Wide spiral flutes quickly remove dust and debris from the cutting area. These bits are designed for rotary drills and are excellent for drilling brick, concrete, stone and ceramic tile (use at a slower speed). They will require more pressure than a hammer drill.