One peg comes out of the salt shaker to refill. 

The salt shaker can be removed from the grinder to refill the peppercorns. 
The pegs do not come out of the pepper grinder (that I can tell). 
There are a few scratches between the barrels - see photos - and I don't think they are noticeable when it's assembled as one piece.
Measures 4" tall and 3.25" in diameter. 
Smoke-free home.