General description For drilling in all kinds of materials, the Bosch 4 Piece Robust Line CYL-9 Multi Purpose Construction Drill Bit Set (5.5-8.0 mm) is designed to deliver precision and durability. It features a centring tip for a precise drilling start and excellent guidance in the drilled hole. Technical specifications Set includes drill bits with diameters ranging from 5.5 mm to 8.0 mm Fine grade high durable carbide for extra long life and best wear resistance 4 flute dura design for reinforced core section Usage Suitable for drilling in concrete, masonry, brick, eternit, light building materials, multi-layer materials, ceramics and tiles, wood, plastic, sheet metals, and aluminium Perfect results when drilling with or without impact