Where would you normally use it ?
On a staircase, as a way of extending the length of the various pin newels that are available.
What is it made out of ?
Plantation grown Australian Oak (depending on availability it is either Victorian Ash or Tasmanian Oak).
What are the important dimensions ?
Overall : 650mm Height x 90mm Width x 90mm Depth
Hole : 70mm deep x 38mm diameter
How should you finish it ?
If looking for a natural finish, then a clear lacquer will be fine; or you can use a stain to achieve your desired colour then use a clear lacquer to finish it off.
Speak to your local paint retailer for more info.