High Quality Diamond Tip Drill Bits: This high quality diamond drill bit is made of stainless steel and coated with diamond particles to create a stronger, more efficient drill head and suitable for working with a variety of delicate materials. Diamond Coating Up to 10mm: This diamond drill bit has a diamond coating up to 10mm, making it sharper than traditional drill bits when drilling and the drill hole is smoother, especially suitable for fine work on porcelain tiles, glass and ceramics. Wax Core for Heat Dissipation: Unlike traditional diamond tip drill bits for ceramics and glass that require water or lubricant to keep them cool, our built-in wax core can automatically absorb and dissipate heat. Wide Application: This diamond drill bit is perfect for drilling granite and marble, masonry, concrete, tile/ceramic and hard plastic. Diamond tip drill bits are ideal for porcelain tiles, granite, marble and stone , masonry, brick, etc. < p> Material: stainless steel and diamond coating;