Whenever you have to drill a hole in brickwork or concrete, whether its for a fixing or for a pipe / cable, etc to pass through, once you have marked the centre of the hole start drilling using a good quality masonry bit with the hammer or SDS action switched off so the drill bit creates an indentation, then you can continue drilling the hole with the hammer or SDS switched back on without the drill bit sliding all over the wall and removing your centre mark. If the hole you are drilling is larger than 8mm I would start off with smaller drill bits and increase the size, re-drilling the … [Read more...]