Need a reliable, simple way to secure hoses? This 30-pack of constant tension spring band clamps is perfect for all sorts of DIY and repair jobs. Each clamp has an inner diameter of 13mm (about 0.51 inches) and is made from durable 65Mn manganese steel with a blackened finish for corrosion resistance. They're called 'constant tension' clamps because the spring design applies even pressure around the hose, which can help prevent leaks better than a screw clamp that can pinch. They are super easy to use – just squeeze the tabs with pliers to open, slide over your hose, and release to clamp. They're great for fuel lines, coolant hoses, silicone intake piping, vacuum lines, air hose, or water lines in cars, boats, or home appliances. This bulk pack of 30 means you'll always have one on hand for various projects. Just make sure the hose's outer diameter is close to the clamp's maximum 13mm spec for the best, easiest fit. A versatile and cost-effective essential for any toolbox.