as above

the bleed nipples on my wilwood 4 pots aseem to be 6.5mm and i have a socket for this size but would like an off set ring spanner to use for bleeding them as i cant keep a socket on there with the bleed tube at the same time

but there aint a spanner for 6.5mm? so do you think its more than likely a 1/4 spanner which is 6.35mm