Designed to be used with the heavy duty fasteners referenced on the table. Receptacle is mounted with three low head cap screws (M3x0.5 - 6 mm long, included). The body is made from 303 stainless steel with an electroless nickel plate finish. The balls are made from 440C stainless steel. The collar is made from quenched and tempered 440C stainless steel. The retaining ring is made from 304 stainless steel.