Another metal item mentioned in the story and movie was wire. Right in the middle of TS1, we are told that Ennis ran full throttle whether fence mending or money spending (I count three metal items in that phrase!) and later on he's running the baler all month. That's why Jack and Ennis have to give up their August together (actually, it turns out, their life together, sob). Jack listens to LaShawn going on about Randall trying to hold a car engine together with chewing gum and baling wire. It's Ennis who's most often associated with the wire, using it to tightly bind or fence something in, so true to his character.