Yes, string trees for the headstock. The bent metal part should sit on a small metal ring to raise it up a bit and held in place by a screw. Fit the strings first then place the bent piece over the D&G and B&E strings (refer to Fender headstocks for typical positions), then you can mark through the hole for a position to drill the pilot hole. It’s important that the trees don't pull the strings to one side and increase friction.

The ‘wire’ is a piece of solder.