Description 7pcs 10 100mm Diamond Hole Saw Drill Bit Set Tile Ceramic Glass Porcelain Marble Hole Saw Cutter Specifications Material Diamond SteelColor silverLength 5cmDiameter 10 25 40 55 70 85 100 mmQuantity 7pcsApplication Glass ceramic tile marble granite and other brittle hard materials Features 1 Unique opening design drilling sharp easy to operate 2 Open hole smooth no broken edge will not produce the phenomenon of tremor 3 Small incision resistance Improve the opening speed Easy to trim after slotting How to use 1 Installed in an ordinary electric drill 2 First 45 degree angle drill position then the vertical drilling 3 Force should be light slow especially in the beginning of the drilling and drilling to slow 4 When opening a hole operation need to add water while operating NoticeTo keep the water drill remember not to dry drilling Package Included 1Set x 7pcs Diamond Hole Saw More Details