Danfoss / Eaton Aeroquip ALUMINUM VICE JAW InsertS

These inserts are made from aluminum, which is soft enough to protect the surface of hydraulic fittings while you're working on them in a vice.

Aluminum vice jaw inserts like these sit between your vise jaws and whatever fitting or hydraulic component you're working on. The idea is pretty simple: aluminum is soft enough that it won't mar, gouge, or scratch the surface of the part while you're torquing things down or breaking a connection loose. For any shop doing regular hydraulic assembly and disassembly, beat-up fittings cause leaks, and leaks cause headaches. Having a set of these on hand is cheaper than replacing a fitting you crushed in bare steel jaws.