Stainless Steel Hex Nut - Coarse Thread: A six sided internally threaded nut designed to be used with Stainless Hardware. These nuts are 18.8 Stainless. Stainless steel hardware is corrosion resistant. The first number is your diameter, and the second number is your threads per inch. Your first column is the total price for 10 pieces up to 7/8". Larger sizes sold by each.