what size for strider pocket clip screw

[jharpphoto]

I have a new deep carry clip coming for my Strider today and NONE of the 50 or so allen wrenches I have fit the screw that holds the pocket clip in place. Why is this always the case. Does anyone know what size wrench I need to remove the pocket clip screw?

 

[Wowbagger]

It is a TORX wrench tip.
It will be best to get a small SET of TORX tips or wrenches in that size range and use the largest size that will fit in the screw head. Using one size down from the correct size is a recipe for rounding the screw head out. Only buy a quality set such as BOSH or Wiha brands.
Be gentle.