Here we have a tool for adjusting the pivot pin on a Strider knife. It is made from 316 series stainless steel and features both the spanner for the large Strider knives (NOT FOR THE PT MODEL) as well as an 1/8 hex wrench. The two halves screw together using a 1/4-28 thread with an "O" ring at the bottom of the thread to keep debris out. Dimensions are 3/8 thick x 5/8 wide x 1 & 3/8 long.
If you have not adjusted the pivot pin on your Strider knife before, I suggest that you hold the end of the knife with the pivot pin in very hot if not boiling water for a minute to loosen any thread lock (Loctite) that the good folks at Strider may have applied.