This is a custom made socket set screw made using 303 stainless steel, passivated to Mil QQ-P-35 Type II.  It measures 10-32 X .415" +/-.010 and is drilled at a diameter of .126 +.005/-.000 to a depth of .250 +/-.005.  We supply them at orders of approximately 1,000 pieces per release and the custom parts are made domestically in the USA.