"I had bought the dewalt blue 'concrete' screws (70mm) and the instructions said to drill a 4mm hole - this was the only drillbit i could find..but its only 75mm so not able to drill the depth needed without lifting the timber (I was trying to fit decking to a contrete ledge without lifting it)..more than 5mm needed in the chuck..
The dewalt screws were a failure, so I needed to fit rawlpugs.This drill acted as a good pilot hole to 'spot' the location and has survived 10 holes with a ryobi 18v hammer drill and mains hammer drill. When fitted in my mains hammer dtill it went through the concrete and into brick underneath."
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Review 2 for Erbauer Pro Masonry Drill Bit 4 x 75mm