The DCK421D2 is a combo toolkit equipped with four tools, namely, an impact driver, a compact drill, a cordless circular saw, and an LED work-light, all manufactured by the Dewalt brand. They're sold together in an easy-to-carry tool bag, weighing a total of 19.6 pounds, with each of the tools running on a 20-volt-maximum lithium-ion battery. The assortment of tools can be used to complete various tasks at the work site.