Material 303 corrosion resistant steel per qq-s-763 cond a; surface finish 32 microinches all over; o/a dim.; lg 0.495 to 0.500 in., w 0.202 to 0.206in., thk 0.225 to 0.227 in., 2 holes 0.067 to 0.070 in. Diameter thru; center to center 0.354 to 0.356 in.; each corner chamfered 0.031 x 40 to 50 degs