Aluminum ams 4016 5052-h32; alodine mil-c-5541 cl 1a; 2.938 in. Long; 2.375 in. Wide; 0.203 in. Diameter 4 holes; 0.188 in. Radius 4 corners; 2.562 in. Center to center distance between holes along length; 2.000 in. Center to center distance between holes along width