Hi howdy folks, a quick Vapor question for ya......

So I bought a used pair of Vapor Breeze bookshelf speakers that are totally amazing.  I wanted to tighten up the drivers in the speakers but I am baffled by the screws they used. to me it looks like a security torques screw with the little metal piece in the middle but none of my wrenches fit.  can anybody please help me distinguish what type/size number of screw they used so I may do some maintenance on these beauties. Thanks so much in advance