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Product Description BOSCH brings constant innovation to concrete and masonry drilling. BOSCH developed custom-manufactured carbide and diffusion bonding technology to provide better performance and durability. Speed-X delivers high performance in precision anchoring and drilling applications. Amazon.com Bosch HC4032 spline rotary hammer bits are carbide tipped and fit Bosch as well as other spline hammers. Speed-X combines the life and durability you expect with the fastest hammer carbide drilling speed ever. It performs even better than any other bit in precision anchoring and deep drilling applications.