core

Rough opening for a door means the opening framed out and no jamb in place yet right? What is the rough opening of a 28" solid core door? Would the jamb for said door be 3/4" thick? What are the measurements of a 28" solid core door? Thanks a bunch.

I recently bought an appliance which came with a 2.5mm flex and as most flexes I've seen the ends of each conductor had a sort of gold crimp like thing round it to make it a solid and I suppose to make a better connection? The flex wasn't long enough so I had to go out and buy a 10M flex but...