The HP 663476-B21 is a friction rail kit designed specifically for the HP ProLiant DL380 and DL560 Gen8 servers. This 2U rail kit utilizes a friction locking mechanism to securely hold the server in place within the rack, eliminating the need for tools during installation or removal. The design allows for quick and easy access to the server for maintenance or upgrade purposes without compromising stability and security. The kit includes all necessary components for mounting, ensuring a compatible and straightforward installation process. Ideal for environments where server mobility and ease of access are prioritized, the HP 663476-B21 provides a reliable and user-friendly mounting solution for critical data center equipment.