Features: 100% Brand New and High Quality For use with conventional power drills on the lower speed settings with the hammer action disabled Always use lubrication (water),otherwise the diamond core drill will burn Cooling and Lubrication Using water as a coolant/lubricant will substantially extend the life of these hole saws. If you're drilling on a vertical surface try a hand spray water bottle, or sponge soaked in water and held underneath, but in contact with the drill bit. Keep the bit as wet as possible during operation, if the bit dries out during use it will overheat and immediately blunt. 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.
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