This optional set of 2 extension hooks can be used to attach our master equipment non-skid pet tub stairs tp38404 more securely to the edge of the tub. The hooks attach easily to the ends of the stairs and expand 2-inch to 5-inch past the end of the stairs. The easy-to-grip screw plastic knobs allow you to tighten the steel extension hooks securely to the ends of the stairs. The stairs are made of 1-inch square steel. A powder-coated dark gray lip hangs 2-1/2-inch over the edge of the tub. The extension hooks can be used on tub-lips up to 9-1/4-inch wide. The hooks attach securely to the ends of the stairs and the edge of the tub. Measures 6-4/5-inch length by 2-1/2inch height by 6-1/2-inch width.