11.1 plate, class 301, qq-s-766, cond 1/2 hard; passivate per qq-p-35 type i, ii, iii or vi; 60.3 mm o/a dia; 10.0 mm o/a d; three holes m4x0.7-6hx6 full thread depth do not break through; one hole m3x0.5-6h through one wall; one hole m2.5x0.45-6h through one wall