The nut on a Suhr truss rod is 1/8" wide.
Suhr guitars have a standard nut width of 1.650". The wider 1.687" nut is available on any bolt-on Suhr neck.
Different guitar builders use different size truss rods. You need the specific type wrench and exact size for your guitar. Some truss rods are adjusted with a socket wrench while others use an allen wrench.