Muninn Grábjörnsson

There are at least three reasons why it's highly unlikely they weren't used for kitting.

At time time, people wore leather gloves.

Knitting wasn't developed yet, the closest was nailbinding which required simple needles.

It was found solely on Roman borders, if it was a common knitting tool, it'd be found elsewhere, like in homes where people knit for fun.

The wear suggest they were used in a stationary way. Not as you tool you rub wool on, and accidentally drop it from time to time.

Recent theories how they were used are:

Measuring time using balls of fat. You place a ball on a hole, set it on fire and when it drops, it means it's time for the next shift of guards.

Proof of craftsman skill. Creation of such complicated device would require a skilled metalworker. So, when a bronzeworker was looking for job, they had to make them this first to prove their skills. In a city, people knew you and remembered you, so you could smelt and recycle the thing, but on borders it might be more useful to keep it around.

It's the Royal Academy of Art Young Artist's Summer Show. One of my favourite exhibitions of the year. Like. Not only are the older kids insanely talented, the younger ones' artist statements will just punch you right in the face.

Jeffrey is my cat and he feels like my heart

Storms in Kansas

The Firehole River, above Old Faithful