The Milwaukee 48-20-8480 is an MX4 4-Cutter SDS-MAX rotary hammer drill bit designed for heavy-duty drilling in concrete with rebar and masonry applications. It features a solid head carbide design that delivers up to 5x longer life and integrated rebar guards for maximum durability in hard aggregate. The 4-cutter geometry prevents lock-up in rebar to reduce downtime, while a sharp centering tip ensures exact spot drilling. Optimized variable flutes remove dust faster to reduce heat and improve cordless efficiency by delivering up to 15% more holes per battery charge. The bit has a 1-3/8 inch diameter, an overall length of 23 inches, and an 18-inch usable drilling depth. It also includes a wear mark indicator to signal when the bit no longer meets ANSI B212.15 requirements