Item Type: Diamond Hole Saw Material: Carbon Steel + Diamond Coating Drilling Hole Depth: Approx. 35mm / 1.38in Shank: Triangular Shank 1Carbon Steel + Diamond Coating: Made of carbon steel with diamond coating, for porcelain, glass, marble, ceramic, rock and granite, etc. 2Thickened Blade: Thickened blade, brazed design, durable, very suitable for drilling clean and accurate holes and cutting out perfect circle 3Longer Service Life: Longer service life, superior performance, and better durability than other ordinary diamond hole saws 4Fine Workmanship: Diamond drill bit is highly wear resistant, fast and efficient, with non slip triangular shank, and fine workmanship 5Good Performance: This is durable diamond bit with good performance, achieving high accuracy and glazed cuttingStart 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. 1 x Diamond Drill Bit 1 x Storage Box