SET OF OPEN HOLES FOR TILES, GRES, TILES, CERAMICS, GLASS, GRANITE, MARBLE intended for making holes in ceramics, stoneware, glass, terracotta This is the most optimal set of diameters available on the market, prepared after consultations with professional tilers, stonemasons and glaziers: 6 mm, 8 mm, 10 mm are used to drill holes for wall plugs 16 mm are larger anchors and threaded rods 20 mm and 28 mm will make holes for central cwo and central heating pipes, co radiators 35 mm, 45 mm, 50 mm are ideal diameters for water and sewage approaches 65 mm is a great size for electrical boxes A diamond in the holesaws offered it is deposited by the galvanic method . This means that holesaws must be cooled with the liquid during operation. You can use an ordinary windscreen washer or a sponge soaked in water. The advantage of this type of holesaw is that the hole made with it is characterized by the lack of any splinters . Hole saws also run dry, but this shortens their service life. Technical data: mounting: quick-release drill chuck working size: 6 - 65 mm designed for wet work rotational speed: 500 - 900 rpm Fine workmanship! Diamond drill bits are marked by high strength and quality at the highest level. They were created for the most demanding. Access to up to 10 holesaws will be used by a layman and a specialist. We recommend that you carry out the work without too much pressure with a wet sponge inserted into the hole saw, spraying outwards at a slight angle. ATTENTION! Designed for wet operation! Set of holsaws! Holesaws are designed for making holes in ceramics, stoneware, glass and terracotta. In order to extend the service life and increase the number of holes cut, work should be done wet. Electroplated diamonds have the advantage over others that the hole made with it does not have any chipping. Dry work with the hole saw, but its service life is shortened.