gcol said:http://www.dm-tools.co.uk/product.php/section//sn/IRW10501940
These are the business. Can be used on wood and masonry.
Found these nice and cheap on Ebay. The only thing is it says designed for cordless (low rpm) does that mean you shouldn't use them in a normal mains drill?
Links in this post may contain affiliate links for which DIYnot may be compensated.