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
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