Lubricants and penetrating lubricants add a slippery film or coating on machinery, tools, or parts to reduce wear and friction between surfaces and keep equipment running smoothly. Lubricants can be applied to bearings, hinges, and other moving parts to limit friction, overheating, or squeaking noises. Dry lubricants leave a dry film or powder that coats rollers, gears, chains, and gaskets to reduce wear and tear. Penetrating lubricants seep between threads and other tight spaces to help loosen stuck fasteners or bolts for removal or to displace moisture and relubricate moving parts.