Fits both 40NB and 50NB posts.  Simply clamps around the post at whichever height you prefer.  Tighten the bolts and the hoop is set.
Related products
Balls
$34.99
Apparel & Teamwear
$36.00
$20.95
$15.50
Balls
$49.90
$64.90
Accessories
Price range: $24.90 through $29.90
Accessories
$14.90