Item Type: Diamond Drill Bit_x000D_ Material: Diamond_x000D_ Color: Blue_x000D_ Drilling Diameter: Approx. 50mm / 2in_x000D_ Total Length: Approx. 68mm / 2.7in_x000D_ Female Thread: M14_x000D_ Scope of Application: Marble, granite and other stone drilling 1[DIAMOND MATERIAL] Using excellent diamond material, with high hardness and wear resistance, improve drilling efficiency. 2[INCISIVE BLADE] The hole opener has a incisive blade, with fast drilling speed, and a smooth cut without burrs. 3[50MM DIAMETER] The hole diameter is 50mm, the size is standard, and the drilling is accurate and stable. 4[WITH M4 THREAD] With standard M4 female thread, easy to install, not easy to loosen or fall off during use. 5[APPLICABLE MATERIAL] The diamond drill bit is suitable for drilling granite, ceramic tile, concrete, marble and other materials.1 x DiamondDrill Bit