The Screw Wingnut for Dingman Mouth Gags is an accessory component used with Dingman Mouth Gags, which are surgical instruments typically used to hold the mouth open during procedures such as tonsillectomies or other oral surgeries. The screw wingnut is designed to secure the mouth gag in place by tightening or loosening the screw, allowing the surgical team to adjust the width of the gag to the desired level of mouth opening.