FresKaro keeps designing and producing high quality products to make our lives easier and happier. If you trust us, please purchase without worry. Life is to Enjoy. Automatically locking, keep your items safe. Less than 1s to open, less than 1s to lock, easy to use, save time. 12KN is around 2698lbs, equal the weight of a small car. It's very strong because it's made of a special material, 7075 Aluminum. 7075 Aluminum material is normally used for Aerospace products. Very smooth surface and never rust though it is used outdoor during rain or snow. Carabiner has an Anti-oxidation coating for a glossy and scratch-resistant finish. It's only 1.09oz(31g)/pc, very light, easy to carry. It's a middle size carabiner, Length 3.19'' , Width 1.69''. It's D-shaped design, easy to hold.