Decided to try these out to affix a radiator to a plasterboard wall. Is it me or are they crap. Use sounds easy but I cannot get on with them. Drill the hole fit the thing into the hole is fine. Now turn the centre with a screwdriver to open the wings. Two problems the screwdriver required is a flat bladed one of an odd size. I have searched my screwdrivers and cannot find one of the correct size either too small to operate the cam or too large to fit into the slots. Other problem is the cam setup is plastic and easily mangled, I managed that no problem! Will be returing to you know where.