JW Winco's Wing screw with threaded stud. Where a greater torque is required GN 431 wing screws are a better solution than knurled screws. Wing screw head: American Standard 316 Series Stainless steel, powdered metal. Threaded stud: American Standard 304 Stainless steel. Cross pin: American Standard 301 Stainless steel. Threaded stud is pressed into wing head and is secured by a dowel pin. RoHS Compliant. Head measures 36mm length by 12mm width by 14.5mm height.