Feature:1. Carbon Steel + Coating: Made of carbon steel with 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 circle3. Longer Service Life: Longer service life, superior performance, and better durability than other ordinary hole saws4. Fine Workmanship: drill bit is highly wear resistant, fast and efficient, with non slip triangular shank, and fine workmanship5. Good Performance: This is durable bit with good performance, achieving high accuracy and glazed cuttingSpecification:Item Type: Diamond Hole SawMaterial: Carbon Steel + CoatingDrilling Hole Depth: Approx. 35mm / 1.38inShank: Triangular Shank Package List:1 x Drill Bit1 x Storage BoxNote: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.