Petzl, Sm'D Triact Lock Carabiner, Highly Versatile, Lightweight, Compact, D-Shaped Locking Carabiner

Nicely made and it locks. I haven't tested it to failure. Good way to secure objects to a backpack.

They are great little tri-locking carabiners with strong KN ratings. And you can use anti cross-loading accessories on them. If you have devices that can be dropped easily but support keeper cords, you can use the keeper cord hole on these carabiners for them as a dedicated connection or use a stopper knot that you can untie when finished.

The SM’d is one of my favorites. Great size and the tether option is externally convenient. This, with the triple action gate, is used as my dedicated locker when in guide mode on a top belay.

I have 2 of these that I use with my GriGri and for clipping into anchors. The extra security from the triple action gate is nice peace of mind. Excellent size and quality. Will definitely purchase again.

Bought for my “new to climbing” gf and it’s been a great biner. The gate functions perfectly and smoothly and I get comfort knowing she can’t forget to lock the gate.

Excellent Auto locking carabiner, I’ve been using with my Petzl GriGri (Grigri 3) and it works smoothly.

Although I use this just for keys it's the best thing by far that I've used!! Thank you for an amazing product!!

Looks damaged or used