The New Dell OK87YW 2U Sliding Ready Rail Kit B21 is a high-quality rack unit designed for use with various Dell server models such as R550, R750, R750xs, R760, R760xs, R7615, and R7625. With a rack unit height of 2U and a rack depth of 1000 mm, this kit includes 2 side panels and offers a convenient sliding feature for easy installation and access. The sturdy construction and compatibility with multiple server models make it an essential component for any enterprise networking setup requiring reliable rackmount cases and chassis.