<b>Specification </b><br> Material : Premium Carbide Tip <br> Package included : 10 pcs,4x 6mm(1/4"),2x 8mm(5/16"),2x 10mm(3/8"),2x 12mm(1/2")<br> Color : Blue & silver <br><br> <b>Product Feature : </b><br> The multi-material drill bit can drill holes on tile,concrete,brick,glass,ceramic,plastic and wood.<br> High quality,durable,pricise drilling in various materials at same time,convinient for use with long life time.<br><br> <b>Note : </b><br> When drilling hard material (glass,ceramic tile,marble or granite),please use water for lubrication.<br> Universal handle for electric drills and bench drills, but NOT fit for impact drills.<br> Please keep away from the kids under 3-year-old to avoid hurting by mistake.<br>