The present invention provides a cage in which a nitride layer is formed on the surface by using an iron and steel material with a carbon content of {HEAD ~ 0.25%} by {TAIL ~ weight} or less, fabricating it into a predetermined shape and conducting nitriding, which is more excellent in slidability and wear resistance than conventional one 
by
The present invention provides a cage in which a nitride layer is formed on the surface by using an iron and steel material with a carbon content of { HEAD ~ 0.25 % } by { TAIL ~ weight } or less , fabricating it into a predetermined shape and conducting nitriding , which is more excellent in slidability and wear resistance than conventional one
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