About This Optimal Dimensions ??Each Diamond drill bit has a diameter of 1/4" (6mm ), total height of 2.44" (62mm ), maximum working depth of 1.37" (35mm ), and diamond height of 0.39"(10mm ) for precise and consistent drilling results Advanced Cooling Technology - The inside of each drill bit is filled with dense cooling wax, which provides superior heat dissipation and prolongs the life of the diamond core bit during heavy-duty applications Versatile Dry/Wet Drilling - Specifically designed for drilling through ceramic porcelain tile, granite, marble, stone, masonry, brick, and normal stone with ease, both in dry and wet conditions Compatible with Angle Grinders - Equipped with a 5/8-Inch-11 thread, our diamond drill bits can be easily fitted onto angle grinders for convenient drilling, cutting, and shaping of your work material. User Tips: To start, begin at a 45-degree angle to create a groove in the material. Then, gradually bring the tool to an upright position and continue drilling in a circular motion. you will enjoy fast and smooth drilling with these Diamond drill bits. Overview Material : Diamond Brand : DKIBBITH Color : Black Style : Hollow Core bits Item Thickness : 2.44 Inches Item Weight : 0.09 Kilograms