In reply to ERU: why do you want to buy this type of expansion bolt? the size of hole you have to drill is significantly larger than the diameter of the protruding shaft and if you want to use standard hangers which are designed to fit over a 10mm shaft you will end up drilling with something like a 16mm bit! You will also end up paying for a lot of extra metal.
I would suggest you buy 10mm through bolts instead. These are loads cheaper and will have an equivalent holding power except in upside down placements where the load is directly outward and where the additional grip of an expansion bolt is safer.
If you are putting any bolt in make sure its stainless and that you use stainless hangers of the same grade. Anything else WILL corrode, will look dodgy after 5 years and will probably be dodgy after 10.
I suggest you do an internet search to get the best price. Stainless 10mm through bolts should be about £1.70 a pop if you buy at least 50.
Best of all, as you probably know, are resin bolts but these are a lot more expensive.
If you are at all unsure about placing bolts there are some good people at the BMC who will be pleased to provide you with detailed advice based on proper research/test pulls etc.