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shells of circular lifting magnets are made from high permeability steel casting as per is:4491(bss-1617), properly machined, to provide the most efficient magnetic circuit. the periphery of the magnet is heavily ribbed to give added mechanical strength and an increased radiation surface to aid cooling. center & outer poles are machine from high permeability magnet steel with cored recesses arrangement to protect heads of through tensile bolts. the faces of poles from spigot joints in magnet shell, the outer poles of larger magnets are skirted for added. the pole shoes are easily replaceable.