HP Work Station require 3.5" Caddy, but you have 2.5" Hard Drive, So you need our this converter to change your 3.5" Caddy to 2.5" Caddy
Compatible Part Numbers:
HP Z600, Z620, Z640, Z800, Z820, Z840,Z440
Works with the following 3.5" HP drive trays:
Fit Model
HP Z600, Z620, Z640, Z800, Z820, Z840,Z440
Package Include
1*Converter
8*Screwer