Castella Newport 50mm T-Knob 316SS – Satin Stainless Steel. Introducing Castella Newport, the ultimate cabinet Cabinet Handle range for those seeking high-quality, durable solutions for both residential and commercial properties. Crafted from 316 marine grade stainless steel, the Castella Newport range offers a sleek, modern aesthetic that will elevate the look of any space. For maintenance we recommend the regular application of a proprietary grade stainless steel polish.