... Zinc Plating(trivalent) Package:Inner (1)name:sleeve anchor(2)size:M6,M8,M10,M12, M16 ,M20(3)with flange type,with hex nut ... greattensile strength, it unusually resistant to vibration loads.2.The anchor is resistant to chemicals, fungus, moisture and other atmospheric conditions ... strength steel and heated zinc plated for maximum corrosionresistance. Metal Sleeve Anchor with hook bolt