Specification: Type: Spring hook Color: Silver Material: Iron with nickel plated Maximum weight capacity: 5kg Dimensions: 20 mm, 30 mm, 40 mm Widely used for hanging rope, zipper, work permit, ID card, key chain, plant, hanger etc. Package content: 20pcs 20mm spring hook 20pcs 30mm spring hook 20pcs 40mm spring hook Type: Spring hook, firmly connected to both ends of the object, will not fall. Material: Made of iron metal with nickel plated, rust and corrosion resistance, high hardness, good toughness. Dimensions: 3 sizes, 20pcs each, the overall length is 20mm, 30mm, 40mm. Use: Flexible snap hanging clip, you can install only by pressing lightly, easy and effortless. Applications: Widely used for hanging rope, zipper, work permit, key chain, plant, hanger and other connectors.