These fasteners are USA made stainless steel precision Torx screws. They are very hard to find!
These are a special designer "shallow" socket style micro fasteners. The head on this model is designed to minimize the depth required, and to greatly reduce excess surface removal. These are very common in modern knives and guns!
4-40 - Socket Head
Thread Length (measured under head) = .245-.250
Head Diameter = .174
Torx Size Required= T-10
(1 Package= 25 screws)