Overview Reviews Product Description Cooper N228 Spring Nut Diameter: 3/8 Inch THRD16 RectangularHD. Product Videos Custom Field Size 3/8 Product Reviews Write a Review Write a Review × Cooper B-Line Cooper N228 Spring Nut Diameter: 3/8 Inch THRD16 RectangularHD Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *