Which Allen Key should I use for the Socket Screw I am using

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Allen key screw (4-40 x 3/8”)., 12pcs. set., Used For: 8108-00, 8166-00, 8163-00, Specs, 4-40 x 3/8”, 12 pcs. in the set, Used For: 8108-00, 8166-00,

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