Tungsten carbide grit cutting edge. Use for drilling holes in floor and wall tiles, and for drilling in aerated and concrete blocks. Pre-drill pilot hole in particle board using jobber or lip and spur bit. Max drilling depth 55mm. Tungsten carbide grit cutting edge. Use for drilling holes in floor and wall tiles, and for drilling in aerated and concrete blocks. Pre-drill pilot hole in particle board using jobber or lip and spur bit. Max drilling depth 55mm.