Description:This diamond coated core drill bit removes a complete circle from glass,tiles,marble,granite etc.Materials and only needs water for lubrication;Can be used with a standard electric drill.Always use lubrication (water), otherwise the diamond core drill will burn.Start your hole diagonally, make a round trace and then hold drill straight.Opening neat,smooth,no broken edges,small incision resistance,opening fast, easy chip advantageSpecification:How to use your Holesaw :In an ideal world your piece of work should be clamped firmly to a bench to allow for slow controlled drilling. Of course sometimes that's just not possible, so if you're drilling in situ or at an awkward angle try the following :Make a template from a piece of timber or waste material, locate this over the area where you want to drill your hole and use it as a "guide" to start the hole. Once you've got into the surface by 1mm to 2mm you can remove the guide and continue to drill in a controlled manner.Start your hole diagonally, make a round trace and then hold drill straight.Package Includes:1 x Diamond Holesaw