Feature: 1. Carbon Steel + Diamond Coating: Made of carbon steel with diamond coating, for porcelain, glass, marble, ceramic, rock and granite, etc. 2. Thickened Blade: Thickened blade, brazed design, durable, very suitable for drilling clean and accurate holes and cutting out perfect circle 3. Longer Service Life: Longer service life, superior performance, and better durability than other ordinary diamond hole saws 4. Fine Workmanship: Diamond drill bit is highly wear resistant, fast and efficient, with non slip triangular shank, and fine workmanship 5. Good Performance: This is durable diamond bit with good performance, achieving high accuracy and glazed cutting Specification: Item Type: Diamond Hole Saw Material: Carbon Steel + Diamond Coating Drilling Hole Depth: Approx. 35mm / 1.38in Shank: Triangular Shank. Package List: 1 x Diamond Drill Bit1 x Storage Box Note: Start drilling at 45 degree angle and drill the hole vertically when cutting the meniscate shaped edge to prevent the hole saw from slipping. Never let your drill dry out, keep moist and cool with water.