Electroless nickel coated components last up to 5x longer before onset of corrosion. Fully enclosed design extends the life of the vise by protecting all internal components and keeping out dust and debris. Lifetime lubricated and permanently sealed for trouble-free service. 3x longer and 2x thicker spindle nut. Ensures a lifetime of smooth spindle movement and straight-line pull. 60,000 PSI ductile iron body.