The DCKTS450M2 20-Volt MAX Lithium-Ion 4-kit (4Ah) with a Tough System features our DCD796 20-Volt MAX XR Lithium-Ion Brushless Compact Hammer drill Kit which is lightweight and compact for working in tight spaces for long periods of time. The DCF885 20-Volt MAX Lithium-Ion 1/4 in. Impact Driver which is compact and lightweight for fitting in tight spaces and increasing productivity. The DCS570 20-Volt MAX XR Circular Saw which features a Brushless motor which provides 5200RPM maintaining speed under load. The DCG412 20-Volt MAX XR Lithium-Ion 4-1/2 in./5 in. Grinder features like Quick-Change wheel release, convenient trigger switch with lock-off button, and extended run-time battery. This combo pack includes a Tough system with wheels, which features durable and thick structural foam walls, integrated water seal and rust-resistant metal latches along with a bonus DCB205 battery.