Cast iron; t-shape design; center post with 0.435 in. Diameter bore; 1.860 in. Bore depth; one corss arm with 0.500 in. Od valve stem cup; other arm with 0.375-24 unf thd hole for adjusting screw; 3.205 in. Lg across arms; 0.720 in. W; 2.125 in. Over all h