【Upgraded High Quality】Compared to standard diamond hole saws, our newly diamond bits features sharper serrated edges and coarser diamond grit. With an enhanced diamond coating, a more robust one-piece steel body, and advanced double-layer surface treatment, it ensures durability, aesthetics, and wear resistance 【Innovative Serrated Design】Our tile hole saw's cutting edge is designed with serrated teeth for increased sharpness, facilitating smoother and more accurate cuts through porcelain,ceramic,granite marble and other stones 【Dual Guide Bits for Enhanced Drilling】This diamond tip hole saw set includes a high-hardness alloy tip pilot bit for precision drilling and a diamond-coated twist pilot bit designed for high-hardness materials. These bits ensure accurate drilling while preventing surface damage 【Wet Use for Optimal Performance】The electroplated diamond coating on this 4 1/8 inch hole saw for tile demands continuous use of water or coolant during operation. This requirement ensures the maintenance of a smooth cutting edge, prevents chipping, and enhances the diamond tile drill bit's longevity and sharpness, making it a reliable choice for demanding drilling tasks 【Detailed Specifications】Featuring an OUTER DIAMETER of 4-1/8 inches, a CUTTING DEPTH of 1-1/2 inches, and a 3/8-inch triangular shank, this granite hole saw is good for various drilling tasks. For comprehensive operation instructions, refer to the included manual Key Features: Serrated Edge: The serrated design of the ceramic tile hole saw helps in achieving clean, precise cuts with minimal effort. Removable Pilot Bits: Included with two removable pilot bits, this feature allows for easy positioning and drilling accuracy, reducing the risk of misalignment. Versatile Material Compatibility: Whether you're working with porcelain, ceramic, granite, or marble, this granite countertop drill bit is up to the task.No Special Guiding Tools Needed 4 1/8" Diamond Bit: The diamond tile drill bit is designed to deliver consistent performance, ensuring clean holes every time.Cutting Depth: 1 1/2 inch.Standard 3/8" Triangular Shank.