Matl iron plate per mil-qq-p-416a type ii class 2; finish w/ cadmium plate and yellow dichromate; o/a dim in in. 1.615 min to 1.620 max outside dia, 1.500 inside dia, 1 hole 0.396 diameter in center of inside dia; 1.249 min to 1.293 max ht; operating temperature m62.0 degrees c to p95.0 degrees c; coil resistance 151.0 ohms; operating v 24.0 to 28.0 dc; 0.380 wt