9-piece long arm hex ball end Allen key set, imperial sizes from 1/16 to 3/8 inch, model 16773-9A, designed for easily loosening and tightening internal hex screws in tight spaces and difficult corners. It features a ball end for working at various angles for easy access, with a long design for better control, and is made from high-quality stainless steel that is resistant to rust and wear for heavy-duty use. Suitable for mechanical and electronic maintenance work and car workshops.