Corrosion-resisting steel ams5504type 410; heat-treated rockwell c40-c45; passivated; spherical indentation 2.00in. Diameter on 8.00 in. Radius; 0.406 in. Diameter hole w/1.25 in. Spotface both sides; 2 holes 3/8-16unc-2b x 0.75 in. Deep 2.50 in. C toc