Tyron Bands

Hi all, a bit of advice please. When I brought my van I had Tyron bands fitted, new to vanning and uber safety conscious etc. However, I believe the dealer should have given me a key so that they could be removed in the event of tyre problems. Is that true because he didn't! Does anyone know if it is an allen key and if so do you know what size it is? If not what sort of key is it please?