Key Specifications/Special Features: Material: steel and stainless steel UNC size: 1/4, 5/16, 3/8, 1/2, 5/8, 3/4 inches Metric size: 8, 10, 12, 16, 20mm Hex flange nut for metric size, hex nut for UNC size Primary Competitive Advantages: Experienced Technical Staff Product Performance Guarantee/Warranty