17” circumference, use J/10 6mm hook (pictured)
14” circumference, use G/6 4mm hook
16” circumference, use H/8 5mm hook

Gauge:
7 dc = 2” with J hook; 4 rows with J hook = 5 1/2”;
with G hook = 4 1/2”;
with H hook = 5”

Also available at Crochet By the Hook blog.