Yankee Hill Machine Sidewinder Direct Thread Adapter 1/2x32 Black. These adapters make it possible to use any caliber Sidewinder on Fixed barrel pistol caliber rifles and pistols. Made from 17-PH stainless steel with a Matte Black Finish. Specifications for Yankee Hill Machine Sidewinder Direct Thread Adapter: Manufacturer: Yankee Hill Machine Color: Black Finish: Black Additional Features: Sidewinder Features of Yankee Hill Machine Sidewinder Direct Thread Adapter: Length: 3/4" Weight: 1.86 oz" Package Contents: Yankee Hill Machine Sidewinder Direct Thread Adapter