By direct tricep work I was referring to SkullCrushers (there are one arm SC's also), French presses and other type of tricep extensions.. Close grip BP, V bar dips, etc are more of a compound type movement. Those I do.
Using my favorite exercise as an example: the DB bent arm pullover & press. An outstanding tricep builder which is seldom done with serious intent. Can get a unbelievable tricep stretch with just the pullover part alone. Also have used a BB, but find it can be a little stressful on the wrist & forearms when heavier weight is used. Believe the record for the BB pullover is over 400lbs, if I remember right.
The Pullover & press (BB or DB) is a stand alone upper body mass builder. Not only triceps but giving outstanding lat's, delts & pec's. Can affect the rib box expansion some, if at a younger age (under 24 to 25, usually). The ab's come strongly into play to. Anyone wish to try a program of GVT (10X10's), using it as the only upper body exercise, may be surprised at the results. Good Luck.