Drum brake cylinder bolts removal?

Hi, I'm currently trying to replace the drum cylinders after they failed on me while driving. The problem I'm having is getting the two very tiny bolts out that hold the cylinders in place. Now, I'm no mechanic. So please be kind when I say I don't know what type of bolt it is. The closet tool I have that fits is a 1/4 wrench. Size fits perfectly but it's the wrong tool. The head of the bolt has a similar resemblance to a torx bit security bit. All personal searches came back empty handed. So, if someone could tell me what specific tools I need for this job I would appreciate your time and effort.