Bosch 7/8" x 16" x 21" SDS-Max Speed Xtreme Rotary Hammer Bit delivers exceptional durability and performance with its carbide heads and innovative four-cutter design. Engineered for drilling in reinforced concrete and hard aggregate, this bit five times the lifespan d to competitors. Utilizing proprietary diffusion-bonding technology, Bosch fuses carbide and steel at a molecular level through a precise high-heat, high-pressure solid-state welding process, ensuring jobsite-proven toughness. As the only concrete bit manufacturer to produce its own carbide, Bosch s quality control on every single bit. The four-cutter design features a 180° cutting diameter and ensures power transfer during drilling. Its active-centering tip creates rounder holes, while the four 90° side angles form a wide, sharp head for precise hole driving. Additionally, the four-flute design aggressively removes dust from the work area, enabling faster drilling and extended bit life. Model Number: