The DEWALT innovative Extreme masonry bit offers excellent quality for all types of masonry work. The drill bits last up to twice as long and delivers up to 50% more holes per charge than a standard masonry bit providing cleaner, more accurate holes for improved fixing. The drill bits feature the following:Unique Carbide Grade - optimum grade maximises durability.Innovative Tip Design - unique design provides an efficient drilling action and reduced walking for greater accuracy.Optimised milled flute - for fast drilling and special copper brazing to withstand high temperatures. Applications:Typically used for drilling anchors, plastic plugs, fixings or pipe work clearance holes.Suitable for masonry, brick, stone, tiles and light concrete. The DEWALT DT6956 Extreme Masonry Drill Bit Set contains a selection of the most popular sizes. Contains 1 of each, of the following sizes: 4.0, 5.0, 6.0, 8.0 and 10.0mm.