The CAT DX21 18V 1 FOR ALL 1-in. Cordless Rotary Hammer Drill with Brushless Motor was born from superior engineering and next-generation battery technology. The result is a rotary hammer drill that boasts outstanding performance and lives up to the legendary Cat reputation for quality and durability. Made specifically to be the professional user’s rotary hammer drill, with the power and functionality to handle a wide variety of rotary hammer drill applications, and the rugged construction to take on tougher jobs. The Cat Cordless Rotary Hammer Drill was built with a high-efficiency brushless motor that provides 25% more power, 50% more run time and 10% longer life than comparable rotary hammer drills with brushed motors. And it runs on the revolutionary 18V 1 FOR ALL battery platform which features cutting-edge advancements in battery tech for more performance and run time. This model comes with two 4.0Ah lithium-ion batteries and a 4A charger. Not only do those batteries power this tool but they’re interchangeable with every other tool in the 1 FOR ALL family, saving you time and money in the long run. Innovative ergonomic design makes this rotary hammer drill easier on the user, too, even for extended periods during the toughest applications. Cat Tools are made for the pros, with advanced features and capabilities that add up to higher productivity and extended run times, with less operator fatigue and reduced downtime. Let’s Do The Work.