Compaq 239158-999 - Mini Tower - Power Supply 250 Watt Hardware Reference Manual page 59

Hardware Reference Guide
Installing a Kensington Cable Lock with a Compaq Type 2
Bracket (may vary by model)
WARNING: To avoid injury, use care in handling the separated pieces
of the security bracket; metal edges may be sharp. Be sure to install the
bracket so that sharp edges do not extend from the edges of the
computer chassis.
Security Lock Provisions
D-3