Bosch PRO SDS plus-5X Hammer Drill Bit 5 PieceSet.Bosch PRO SDS plus-5X Hammer Drill Bits are made from an embedded cross of high-quality tungsten carbide, the 4-cutter head offers convenience to professionals who need to drill accurate holes in reinforced concrete. Its 4 flutes channel dust away from the impact point, ensuring effective and long-lasting performance.Reinforced concrete is a common material in infrastructure, commercial and domestic construction, and workers such as electricians, plumbers or HVAC installers often need to drill into it. PRO SDS plus-5X Hammer Drill Bits are designed for this tough task.Contains the following sizes:5mm, 6mm (x2) , 8mm, 10mm.