Liberty Brass We’re celebrating 100 years of providing automatic screw machine products of the highest caliber. And we’re more than just brass — we’re aluminum, steel, stainless steel and even plastic. Let us help We’re celebrating 100 years of providing automatic screw machine products of the highest caliber. And we’re more than just brass — we’re aluminum, steel, stainless steel and even plastic. Let us help you make a custom product possible or purchase a top-of-the-line part from our line of stock brass decorative fittings.