The S-Biner SlideLock clip from Nite Ize has sliding plastic locks on the gates (openings) that keep them closed so nothing on the clip slips off. Developed for holding items such as keys, key chains, key lights, keyless entry systems, or even bigger items like silverware and water bottles. Built from stainless steel, so it is very durable. The dimensions are these: Size #2: 0.9 in./22 mm (L) x 2.0 in./50 mm (W) x 0.3 in./8 mm (H); Weight: 0.24 oz./7 g; Weight rating: 10 lb. Size #3 is: 1.2 in./30 mm (L) x 2.7 in./68 mm (W) x 0.4 in./10 mm (H); Weight: 0.53 oz./15 g; Weight rating: 25 lb. And Size #4 is: 1.6 in./40 mm (L) x 3.6 in./90 mm (W) x 0.4 in./11 mm (H); Weight: 1.09 oz./31 g; Weight rating: 75 lb. Sold as a 3 pack retail card of varying sized clips: Size #2 is small, size #3 is medium, and size #4 is large.