Our circa 1s century BC to 1st century AD toggle is 82 mm long and weighs 45 grams.
It is thought these bridle toggles were used to link the chariot trace leathers on to the body of the vehicle. According to the UK finds database, examples have been excavated from late Iron-Age chariot burials. Such burial finds are rare in the UK. This British Archaeology article for example reports that there are only 20 such finds in England; all in Yorkshire. There is one find in Scotland.
Photos John McCullough