McMaster M3-T10 & M2.5-T6 Screws (compatible with LDY, H.R, TheOne, etc.)

https://www.mcmaster.com/products/screws/torx-rounded-head-screws/metric-18-8-stainless-steel-button-head-torx-screws/

For use with many Chinese balisong manufacturers (LDY, TheOne, H.R, etc.).

Between M3 and M2.5, M3 is more common (compatible with LDY Cygnus, H.R. Rich, and others).

Note that the Torx drive between these is different; M3 has T10 drive whereas M2.5 has T6.