The SDS-Plus MX4 drill bits from Milwaukee are built for the most demanding concrete and rebar applications. They feature fully welded solid carbide tips (up to 20 mm) for maximum durability and high-speed drilling. The 4-cutter tip combines a sharp centering point, rebar guards, and dust grooves to deliver clean starts, precise holes, and long life even under extreme jobsite conditions. An optimized flute design with a reinforced core and alternating SPEED and HEAVY-DUTY spirals ensures fast debris removal, reduced friction, and superior stability. The convex shank maximizes energy transfer from tool to tip, improving impact force, drilling efficiency, and productivity. For diameters over 20 mm, the one-piece slotted carbide tip provides exceptional strength and break resistance. PGM certified and made in Germany, these bits offer precision, reliability, and uncompromising performance on every jobsite.