Multi construction, quick change bit set suitable for use with impact drivers. Multi construction means they can be used on masonry, wood etc. £9 off makes them a good deal and 110 in stock at my local branch so you should be able to find some. Most popular sizes 4, 5, 6, 7, and 8mm.
DeWalt DEWALT MULTI-MATERIAL IMPACT DRIVER DRILL BITS SET 5 PIECE SET was £13.99 now £4.99 @ Screwfix. Free C&C.