"Needed a 16mm masonry drill bit on Bank Holiday weekend and Screwfix fixed it for me. In my haste I ordered a standard bit when I really should have bought an SDS! However used an smaller SDS that I had and then used the standard bit to widen our hole to size needed. On sorting out my garage found an SDS to standard chuck that I forgot I had so next time could use that in an SDS drill. Sorted!"