Angle iron with lengthwise/longitudinal slots 7x30mm on one side for universal support. Can be used to support cable trays, cable ladders and electrical installations. As a source manufacturer, we offer a full range of custom hot-dip galvanized angle iron, including equal/unequal-legged, perforated, and slotted configurations, meeting the rigid support requirements of power towers, cable trays, and iron accessory connections. Edges and bolt holes are not rounded or otherwise prepared. Angle steel is mainly used for support.