U-Turn - 3/8"-16 Aluminum Hex Nut (50 Count) - An internally threaded fastener with a hexagonal shape designed to be screwed onto an externally threaded screw or rod with the same thread pitch and of similar material properties. The hexagonal shape permits tightening with a hex wrench. Aluminum is a light weight, non-toxic, non-magnetic material that provides a high degree of corrosion resistance and is 100% recyclable. Suitable for use both indoors and outdoors.