This listing is for new US / Inch Hex Nuts in Stainless Steel. These are Hex Machine Screw Nuts in 18-8 / A2 Stainless Steel for sizes up to #10, Standard Finished Hex Nuts for 1/4″ and beyond. Available sizes: Machine Hex Nuts#0-80, #2-56, #3-48, #4-40, #6-32, #8-32, #10-24, #10-32 * Also Finished Hex Nuts:1/4″-20, 1/4″-28, 5/16″-18, 5/16″-24, 3/8″-16, 3/8″-24