HPE 874569-B21 Ml350 Gen10 NVME 8 SFF Exp Bay Kit, Compatibility: HPE ProLiant ML350 Gen10 Server, Product: Drive Enclosure. This item, 874569-B21, is the HPE retail number for the product described as ML350 Gen10 8SFF NVMe SSD Express Bay Enablement Kit with 2x4NVMe Risers and Support Cables. Further details below.