UNC Hexagon full nut 3/4 inch -10 A4 Stainless Steel A4 grade stainless steel has a greater corrosion resistance than A2 in certain environments. It is often used for Marine applications especially when coming into direct contact with salt water Dimensions: 3/4" x 10 TPI 31 mm Across the flats 28 mm Point to Point 16 mm thickness