Oporto-type grate and frame assembly for installation over a drain. The grate is hinged with a 110º opening angle and has a textured, anti-slip surface. Once installed, the grate cannot be removed from the frame. Absorption area: 1054 cm². External frame dimensions: 730 x 420 x 80 mm; grate dimensions: 600 x 350 mm; clear opening: 550 x 300 mm. Manufactured from ductile iron according to UNE-EN 1563, class EN-GJS-500-7. Complies with UNE-EN 124-2, class C250. Finished with asphalt black paint.