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. Spline thru-hole rotary hammer bits offer less vibration and quieter operation thanks to an efficient design that maximizes the power of the hammer. Amazon.com Bosch offers a full line of carbide bits, carbide cores and steel points and chisels for hammer drills, rotary hammers and demolition hammers. spline thru-hole rotary hammer bits offer less vibration and quieter operation thanks to an efficient design that maximizes the power of the hammer. Bosch provides a complete line of corded and cordless power tools and accessories engineered to survive any jobsite and allow professionals to take control of their work.