If like me you are looking to hang a tv , boiler or any other load onto a dot & dab or other external wall you can do no better than these. they are fantastic they grip better than a Rawl bolt especially into breeze block they do an m6 & m8 type, they're easy to fit. 12mm masonary bit into wall, rigi plug in then rigi in tighten with an Allen key, then put your bracket on an screw the additional Phillips screw into the bolt. I've used these on a tv & a boiler up to now & it's solid no need for resins or anything. Great stuff.