20V 4-1/2" brushless small angle grinder requires no time changing brushes, and offers a longer motor life. It offers a high level of protection. Its break stops the wheel in 2 seconds or less. The Kickback Break engages maximum force to stop the wheel when there is a pinch, stall, or bind-up to reduce kickback. The grinder will also shut off in those events to further protect the user. This kit includes our most powerful battery in its class**, the 20V MAX* DEWALT POWERSTACK 5.0 Ah battery. The DEWALT DCBP520 is compatible with all 20V MAX* tools and chargers.