The Vaunt 'Endurance' 10 piece cross tip drill bits set is built to last in the toughest materials!! The Cross-tip design ensures that all 4 cutting edges work at the same time to increase durability, overall lifetime and to provide an even drilling action. Special flute geometry for increased waste removal. All this adds up to a very efficient, hard-wearing drill bit! Contains the most popular 5 sizes 2 x 5.5x160mm 2 x 6.5x160mm 2 x 7x160mm 2 x 8x160mm 2 x 10x160mm 1 x Canvas storage roll Designed for endurance and durability Ideal for hammer drilling into hard materials such as; concrete, granite, brick marble 4-way TCT 'cross-point tips' are more efficient and hardwearing suitable for hard materials including engineered brick, concrete, reinforced concrete.