The U Just unit is an extremely popular portable unit for home and school use. Two U shaped bolts attach the board and ring the the pole, these can be adjusted allowing the ring to be set at any height.

U Just system allows for any height adjustment up to official 10' (3.05m)
18'' (45cm) Steel Ring
Compatible with 215 flex ring
Durable fan shaped polypropylene backboard measuring 44 x 28'' (112 x 71cm)
Heavy duty pole for strength and durability
Wheels for easy movement
Approved by England Basketball and Basketball Scotland
Ballast requires 190kg dry sand or 110 litres of water
Size of box 47'' x 37'' x 10'' (119 x 95 x 25cm)
Weight 40kg