To cope with design diversity by mounting an irregularly or geometrically patterned surface plate on the surface of an aluminum die cast grating for use at a scupper for a pavement or a gutter.

An irregularly patterned surface plate 2 made of an abrasion- resistant synthetic resin or synthetic rubber is mounted integrally on the surface of an aluminum grating 1 which is cast using a relatively small die casting machine Drain holes are provided in advance in the parts of the surface plate 2 which overlap with holes in the grating 1, and fixed pieces 3 molded integrally with the surface plate 2 are fitted into the grooved parts of the grating 1. Alternatively, the fixed pieces 3 may be bonded or welded in place. To connect the adjacent gratings 1 together, either a joint bar, a joint pin, and the lie are used or their connection end faces are formed into hemisherical or triangular shapes, etc., for a recess-and-projection fitting Therefore, the aluminum grating 1 is simplified and miniaturized to make its cost as low as possible and to cope with design diversity.