Well, do I?

Yes

yep

Basic cyberware uses an Imperial/US standards wrench to attach stuff like armor.

Alpha and Beta uses a Metric wrench

Delta uses a custom made tool for the job.

Now it makes sense. Thanks!

Just teasing about the wrenches really, but pg 451 does state all accessories and add-ons must be of the same grade as the implant to which they are added if you are looking for the page referring to this.