"The bolts are more than just good at their job. Fitting is childsplay. They require 2 holes (one in the material to be fixed and one in the brickwork). Not only are the bolts the size they claim to be but the size is very cearly marked so you won't use the wrong drill bit and end up witha swiss cheese brick.
And its not just the product thats good. I picked a bolt that was too short. Screwfix changed it without any quibble and thats why I keep going back to them time and again."
"have been using some equivalant products from a well known diy store. Bought these, they were cheaper and of better quality. used in stone walls and only had one failure. previous product probably had a 50% failure rate"