This DEWALT Extreme Masonry Drill Bit has the following specification: Diameter: 4mm Overall Length: 75mm Working Length: 50mm The DEWALT Extreme Masonry Drill Bits offer excellent quality for all types of masonry work. They last up to 2 times longer and deliver up to 50% more holes per charge on a cordless drill than a standard masonry bit. Optimum carbide grade maximises durability. A unique tip design provides an efficient drilling action and reduced walking for greater accuracy. Optimised milled flute offers fast drilling and the special copper brazing withstands high temperatures. Applications: Typically used for drilling anchors, plastic plugs, fixings or pipework clearance holes. Suitable for masonry, brick, stone, tiles and light concrete.