The tool that I had was about 18 inches long and was angled at the swivel head. It was sized for the block plugs. I was able to reach the open hole from the bottom of the car. I replaced them all when I rebuilt the engine. The flange of the tool drove all the plugs to the same depth.
Yeah,thats exactly like this tool. The correct plug discs snap onto the ball end of the tool. They have a spring clip to keep them from falling off.
It was my understanding this tool is used to replace the core plugs with the motor in the car. At least thats what ive read. Hence the long angled wand. If the motor was out of the car I could just drive them in with a socket like JunkyardHero said