Set of 10 pcs Drilax Diamond Coated Drill Bit Size 3/8 inch in Glass Marble Granite Ceramic Porcelain Tiles Bottles Fish Tanks Stones Rocks Gems DIY Kitchen Bathroom Renovation Drilling - Bul

Set of 10 - Bulk Package High quality DIY standard diamond drill bit (hole saw). Diamond coated tip goes through Tiles Glass Fish Tanks Marble Granite Ceramic Porcelain Bottles and Stones Can be used with Handheld or Upright Drills The diamond particle coating on Drilax hole saws give superior performance and lifetime. Please note our tools do not need center pilot holes. Center pilot hole drills are mostly for wood metal etc. Electroplated diamond coating will wear off if the tool gets too hot. Never let your drill bit run dry. Shank size is 3/8 inch - suitable for standard drills. Maximum depth of cut is 1 inch Here is how you could use water to keep the tool cool: a- You can build a mini water dam around the hole with plumbers putty. b- You can choose to spray water on the drill bit. c- Or you can use running water to cool the drill bit. EASY TO USE Center pilot drill bits are for wood metal etc.; Here is how you can keep the drill bit on target: a- You can make your own guide out of plywood - plastic or even a card board. All you need is to keep the drill bit in place until it makes the initial marks. b- You can start drilling at an angle with the edge of the drill bit making a C slot and then getting the drill bit up to vertical. c- You can manually guide the drill bit with wet sponge.