Aluminum alloy plate; 5 in. Dia. ; 0.434 in. Depth ; 3 holes, tap 0.209 dia. Thru, evenly spaced on 4.5 in. Dia.; 11 holes, irregularly spaced; 0.261 in. Nom. Dia. Thur, 0.390 in. Nom. Dia. C'bore; off-center center hole, 0.875 in. Top dia., tap 0.438 in. Dia. Thru, c'drill 0.448 in. Nom. Bottom dia.