The Titan Professional Tools 17-pc Impact Adapter Set, No. 81483, are heavy-duty impact grade and made of heat-treated chrome-molybendum. They're coated in corrosion resistant black phosphate and are laser etched for easy identification. The components also feature quick change spring-loaded detent balls to ensure a tight, secure fit. The set includes 1/4", 3/8", and 1/2" universal joints; 1/4", 3/8", and 1/2" wobble extension bars in various lengths; and 1/4", 3/8", and 1/2" adapters. The set comes packed in a convenient organizer tray for storage.