... , aluminum support keel, gypsum board support keelMaterial: Aluminum-alloyFeatures: High strength, distortion-freeSize:Main beam: 16*32/30/28mmU profile: 16*20mmWall ... angle: 12*18mmDescription:U-shaped groove, sample and elegant in style, comparing with flat keel, the products ... decorative effect of the product is pretty good. aluminum support keel made in china