Q 1. Where would you normally use treated timber newel post ?
As the post against the wall as part of a balustrade, perhaps on a balcony or verandah.

Q 2. What is it made out of ?
Plantation grown Radiata Pine that has been H3 treated (suitable for above ground use).

Q 3. What are the important dimensions ?
Overall : 1320mm Height x 90mm Width x 42mm Depth
Length of top turning : 125mm
Length of top square : 200mm
Length of turning : 555mm
Length of bottom square : 440mm

Q 4. How should you finish it ?
A water based primer/undercoat is not a necessity (although it wouldn’t hurt), but at least 2 coats of the final colour is a must.
Leaving it unfinished, oiling it or using a clear lacquer is not recommended.
Speak to your local paint retailer for more info.