1DIAMOND COATING: The diamond hole cutter is made of carbon steel, with diamond coated hole saw bit, extremely sturdy and durable 2SUITABLE FOR A VARIETY OF MATERIALS: Can be used for porcelain, glass, marble, ceramics, rock and granite, etc. 3GOOD QUALITY DRILLING: Thick blades with brazed design, very suitable for drilling clean and accurate holes and cutting perfect circles 4LONGER SERVICE LIFE: Heavy duty hole saws have superior performance and durability than other ordinary diamond hole saws 535MM PUNCHING DEPTH: Of sharpness cutter head bring fast drilling speed, punching depth up to 35mm, useful and practical Item Type: Diamond Drill BitMaterial: Carbon steel and diamond coatingPunching Depth: Approx. 35mm / 1.38inHandle: Triangular handle Package List 1 x Diamond Drill Bit1 x Storage Box Notes: Start drilling at a 45 degree angle, and drill vertically when the edge is cut to avoid the hole saw from slipping. Never let your drill bit run dry, use water to keep wet and cooling. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.