Machined from AISI 304 STAINLESS STEEL, with four adjustment points, Alloy 304 is an austenitic stainless steel. It is essentially non-magnetic. Its low carbon content with respect to alloy 302 provides better resistance to corrosion. With a polished and engraved finish, internal diameter 33 millimeters, x 28 threads (TPI), external diameter 42 millimeters, adjustable with pinions of from 12 teeth becoming the best adjustment option for our Trabocchi Clubs