Superior Diamond Tip Drill Bits: This superior diamond drill bit is made from stainless steel and coated with diamond particles to create a stronger, more efficient drill head and for working with a wide range of delicate materials. Diamond coating up to 10mm: This diamond drill bit has diamond coating up to 10mm, which makes it sharper than ordinary drill bits when drilling, and the drilled hole is smoother, especially suitable for work thin on porcelain tile, glass and ceramic. Wax core for heat dissipation: unlike standard diamond tipped drill bits used for ceramic and glass which require water or lubricant to keep them cool, our built-in wax core can automatically absorb and dissipate heat. Widely Application: This diamond drill bit is perfect for drilling granite and marble, masonry, concrete , tiles / ceramics, hard plastic. Diamond tip drill bits ideal for porcelain tile, granite, marble, stone, masonry, brick, etc. Material: Stainless Steel and Diamond Coating; Shank: 6mm Diamond Coating up to 10mm Size: 6mm, 8mm , 10mm, 12mm Warm Tips: Usage Tips for Vacuum Brazed Diamond Core Bits 1.Do not use these bits with hammer mode 2. Only install these bits on corded drill, not cordless drill (not enough power) 3.Only for tile drilling, not recommended for material behind tile 4.For horizontal drilling, just give light pressure, for vertical drilling, the weight of the machine will give sufficient pressure Start drilling according to the following instructions: 1) Position the drill at a 45 degree angle 2) Drill until the hole begins to form 3) Bring the drill into position vertical 4) Keep drilling and swinging the machine along a circle Package:4pcs vacuum brazed diamond drill bits