286565 Concrete/Natural Stone Drill Bit'3750 Proxtreme' 5.31inx5mmx7.87In - -. 286565 Concrete/Natural Stone Drill Bit"3750 Proxtreme" 5.31inx5mmx7.87In - -. Three-edged "tri" shank prevents slipping in the drill chuck 。 Extremely high speed thanks to optimal tip geometry and large-volume helix design 。 Heller curing technology ensures extreme performance characteristics and break resilience 。 Powerful. Durable. Convenient: The multi-talent for concrete and all natural stone types with superior performance. Longest service life and excellent positioning behavior. 3-edged "Tri" shank prevents slipping in the drill chuck. A wide range of applications and perfect centering thanks to ground carbide plate and high-strength tip soldering. Specially designed for challenging drilling, e.g., in concrete, granite, marble and vertically perforated bricks. Extremely high speed thanks to optimal tip geometry and large-volume helix design. Heller curing technology ensures extreme performance characteristics and break resilience. Can be used for hammer drilling and rotary drilling. 。 。 。