Diameter 4 1/8"(105mm); Diamond height 10mm Each Tile Hole Saw with a Removable Diamond Tipped Drill Bit. No Special Guiding Tools Needed The glass hole cutter is made of iron alloy, which is very sturdy. At the same time, the surface is nickel plated, which has good rust resistance, corrosion resistance and prolonged service life The diamond drill bits with thicker diamond coating make the edge of the groove sharper, which can achieve smooth and high precision cutting. Large chip holes on the side can remove waste, ensuring smooth and accurate punching Begin drilling approximately at a 45（between the hole saw and the working surface）angle and only moderate pressure is good for the service life of the hole saw. Good performance:diamond dust coating offers superior performance and cutting strength.Wide application of the Tile Hole Saw: coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and only needs water for lubrication.