Key Specifications/Special Features: Material: steel and stainless steel Metric size: M5, M6, M8, M10, M12, M16, M20 UNC size: 3/16, 1/4, 5/16, 3/8, 1/2, 5/8, 3/4 inches Assembled with hex nut, washer and spring washer Apply to heavy duty Primary Competitive Advantages: Experienced Technical Staff Product Performance Guarantee/Warranty