Specification:Type: Spring hookColor: SilverMaterial: Iron with nickel platedMaximum weight capacity: 5kgDimensions: 20 mm, 30 mm, 40 mmWidely used for hanging rope, zipper, work permit, ID card, key chain, plant, hanger etc.Package content: 20pcs 20mm spring hook20pcs 30mm spring hook20pcs 40mm spring hook