Bosch 4 Piece Robust Line CYL-9 Multi Construction Drill Bit Set Bosch MultiConstruction bits are perfect for cordless drills and for most materials including concrete, brick, block, steel, wood & plastics without the use of hammer action. They\'re the perfect all rounder you should always have in your tool kit. FEATURES Durable tungsten carbide with fine grit: High durability and best resistance 2-fluted, AWB brazing and hardening: Diameter optimized solder and curing technology to increase the robustness of the drill and to decrease the vibration during drilling Diamond-ground cutting edges: A special grinding enables multi-purpose drilling 4-spirally Dura Style: Reinforced core diameter for greater durability and stability when drilling in concrete Brad active for active cutting in concrete Best results when rotating and hammering APPLICATIONS Suitable for practically all materials such as concrete, masonry, brick, eternit, light building materials, multi-layer materials, ceramics and tiles, wood, plastic, metal sheets and aluminium SPECIFICATION Drill hole Ø: 4 mm, 5 mm, 6 mm, 8 mm Material: Carbide metal Material suitability: Wood, Masonry, Metal, Tiles, Stone, PVC Tool holder: Cylinder shank