1、Good Compatibility: The impact drill bits are practical and have good compatibility, suitable for Bosch, for Hitachi, for Hilti, etc. 2、Spiral 2 Flutes: Impact drill bits ensure fast cutting speed, spiral 2 flutes, and slot type, allowing you to have good working efficiency. 3、5Pcs in Total: There are 5 bits in the rotary hammer drill kit, the number of bits to meet your daily needs, strong and durable, wear resistant and fast. 4、Keeps Cool: This impact drill bit allows the material to drain out of the hole quickly while keeping the concrete hammer bit cool. 5、Applicable Materials: Our rotary hammer bits can be applied to brick, stone, concrete and block, making them good industrial and home improvement helpers.