The DEWALT D25481K 1-9/16 inch SDS MAX Combination Hammer Kit is a high-quality rotary hammer drill designed for corded electric power sources. With a speed of 540 RPM and a chuck size of 1 9/16 inches, this model is ideal for various drilling and hammering tasks. The kit includes one item and is specifically designed for use with SDS-Max chuck types, making it a versatile and reliable tool for professionals and DIY enthusiasts alike.