What size is a 3.5 mm crochet hook?
A 3.5 mm crochet hook is a crochet hook with the metric measurement 3.5 millimetre (mm).
It is also known as the E or 4 crochet hook with US terms. It doesn't have a UK equivalent.
What letter crochet hook is a 3.5 mm crochet hook?
In the US lettered crochet hook system, it is know as the E crochet hook.