<b>Product Specification:</b><br> Package quantity: 10 Pcs, 1 x 3mm, 1 x 4mm, 1 x 5mm, 2 x 6mm, 2 x 8mm, 2 x 10mm, 1 x 12mm.<br> Material: High quality tungsten carbide tip <br> Shank: 3-flats shank <br> Color: Black & Silver <br> Used for：tile, concrete, brick, glass, plastic and wood,etc<br><br> <b>User Instruction:</b><br> Tool: Power drill. Do not use impact mode of drill or hammers.<br> When drilling hard material (glass, porcelain floor tile, marble or granite), please use water or oil for lubrication.<br>