Extreme(TM) Masonry drill bit offers excellent quality for all types of masonry work. Lasts up to 2x longer and delivers up to 50% more holes per charge than a standard masonry bit providing cleaner, more accurate holes for improved fixing. Unique carbide grade for long life and greater durability. Inovative tip design provides an efficient drilling action and reduce walking for greater accuracy. Milled flute for fast drilling and special copper brazing to withstand high temperatures Supplied in a plastic cassette case. Contents - 4, 5, 6, 8, 10mm Material - Tungsten Carbide