What is a 6.5 mm crochet hook?
A 6.5 mm crochet hook is equivalent to a US K or 10.5, as well as a UK size 3.
What letter is a 6.5 mm crochet hook?
It's a crochet hook with the letter K.
What is a K crochet hook equivalent?
It's a 6.5 mm crochet hook and can also be called a size 10.5 crochet hook in US terms.