1、DIAMOND COATING: The diamond hole cutter is made of carbon steel, with diamond coated hole saw bit, extremely sturdy and durable 2、SUITABLE FOR A VARIETY OF MATERIALS: Can be used for porcelain, glass, marble, ceramics, rock and granite, etc. 3、GOOD QUALITY DRILLING: Thick blades with brazed design, very suitable for drilling clean and accurate holes and cutting perfect circles 4、LONGER SERVICE LIFE: Heavy duty hole saws have superior performance and durability than other ordinary diamond hole saws 5、35MM PUNCHING DEPTH: Of sharpness cutter head bring fast drilling speed, punching depth up to 35mm, useful and practical Item Type: Diamond Drill Bit Material: Carbon steel + diamond coating Punching Depth: Approx. 35mm / 1.38in Handle: Triangular handle 1 x Diamond Drill Bit 1 x Storage Box