A 5-piece set comprising sizes 4mm, 5mm, 2 x 6mm and 8mm. These Bosch HEX-9 multi-construction drill bits are suitable for drilling a variety of materials. They perform well in concrete, brick, wood, plastic, thin sheet metals, ceramic and tile. They are effective and produce quality results whether drilling with or without impact. The 1/4" hex shank of the HEX-9 bits allows you to use them in an impact driver. HEX-9 bits have a robust, carbide-centring tip for a precise start and good control when drilling. The drill bit is sharp and diamond-ground cutting edges ensure an extra-long working life. The twin U-shaped flutes ensure rapid waste removal for quicker, cleaner results.