Nite Ize, Inc. SB2-A1-3R3 Nite IZE S-Biner Stainless Steel 2, Gated Keys and Gear, 3 Pack, Black/Stainless Dual Carabiner

Having these allows one to hang small items off of back pack for handy access. These are also great for keeping several things together without havinng to use strings. I found that you can use them on crusie ships to hang things on the little knobs use for coat hooks. Over all these little devices makes for quick connect or relase devices where ever there is a loop avaliable and you want to make sure what ever is attached is not lost or misplaced.

These S biners are very handy. I’ve use them over the years and never had an issue. The option of different sizes makes them great for different light applications .

These do not have the lock but they are very sturdy.

Sometimes you want a clip to be secure where it is, and hook other things to it. When a traditional carabiner, you need to open a gate that has the potential of unhooking the carabiner itself. With the S-Hook design, the clip attaching the carabiner stays closed while the clip for connecting a line can be opened. It's so handy for key fobs and adding attachment points to other gear.

Perfect size carabiner. Works just the way I intended.

As others have reviewed, I did not receive 3 different sizes as shown on the product page. I received 3 of the same size.