The Rules of Netball published by World Netball in 2024 refers to very specific technical guidance for goal posts.

" a goalpost is placed at the mid-point of each goal line so the back of the pole is at the outer edge of the goal line. It is inserted in the ground or sleeved beneath the floor so when it is knocked there is a minimal amount of movement, and it remains stable.”

a goal post consists of the following:

• Vertical metal pole 65-100mm (2.4-4in) in diameter and 3.05m (10ft) high that is covered with padding of uniform thickness not more that 50mm (2in) thick and extending the full length of the pole.
  

• Curved horizontal metal ring made of steel rod 15mm (5/8in) in diameter with an internal diameter of 380mm (15in)
  

• Horizontal metal bar of length 150mm (6in) projecting from the front edge at the top of the pole, to which the ring is attached
  

• Net (preferably white) fitted to the ring, clearly visible and open at top and bottom. The minimum length of the net is 380mm (15in) and maximum is 457mm (19 in).
  

England Netball recognises that where is not always appropriate or possible to fit International standard posts.

Alternative posts can be used for domestic training, recreational use and junior competition.

For adult County leagues, performance netball and higher levels of competition, either socketed or floor fixed posts with post protectors are strongly advised.

For further guidance on prices and netball post, please contact our official netball post partners Harrod Sport.
https://www.harrodsport.com/netball/c-nbl