https://www.jpcorry.com/jp-corry-products/eurospec-easi-t-5-lever-security-dead-lock-silve/
Eurospec Easi - T 5 Lever Security Dead Lock Silver Pc/Sc
Eurospec Easi - T 5 Lever Security Dead Lock Silver Pc/Sc
Eurospec Easi - T 5 Lever Security Dead Lock Silver Pc/Sc
Description

 

This lock contains bolt through holes either side of the spindle hole, which enable use of the through bolts

You would generally select this type of lock for exterior doors, when an insurance rated lock is required.

v1.3.2.1