"At last an electrical box sinking kit that is both affordable and effective. I had around 25 electrical boxes to add to a kitchen and utility refurbishment and this kit was brilliant in both brick and concrete blocks. With just the single box cutting tool I was able to do doubles and twins as well. The only slight gripe is that Screwfix omit the dust shield from their kit and I'm sure this would have made it less messy, but thoroughly recommended nevertheless. Please note the average rating for reliability is that I have not used it enough to make an accurate assessment."