Black Diamond RockLock Screwgate Carabiner
Black DiamondRockLock Screwgate Carabiner

BD's Biggest.

The RockLock Screwgate Carabiner is Black Diamond's biggest biner for belaying, top rope anchors, and long-lasting durability in the climbing world. Black Diamond designed this locker with a keylock nose for snag-free unclipping, a curved spine for a larger gate opening, and a square hinge to hold your belay device in place.

  • Screwgate locking carabiner
  • Snag-free keylock nose
  • Reviews
  • Q & A

Best Belay Biner

  • Familiarity: I've put it through the wringer

This carabiner compliments any ATC so well. They are big and durable which allows them to outlast much rope drag. I also really like how they are round, smooth, and easy with the rope. It is reassuring to know that when there is a lot of tension on the rope held by the carabiner that it is not harming the rope in any way. I have one of these for every ATC that I have and I have not had any regrets.

No doubts

  • Familiarity: I've put it through the wringer

I have been using Black Diamond carabiners for years. Love this carabiner. The screwgate is easy to use, and leaves me feeling confident.

It works.. but I hate the screwgate

  • Familiarity: I've used it several times

The biner itself is sturdy and large, but the screw motion of the gate feels cheap and poor. If you've touched a screw gate on a Petzyl, they feel great--tight, smooth, clean, and secure. The Rocklock feels cheap and inaccurate and displeasurable. I'd recommend the Petzl Attache or Wiliams Locker over this one. Still a great locker that will do the job, though. But I won't be buying more.


  • Familiarity: I've used it once or twice and have initial impressions

Biner is exactly what I expected, nothing fancy but works great. The screwgate is very smooth and easy to operate.

Great Gear

  • Familiarity: I've put it through the wringer

Like everything Black Diamond produces, their climbing hardware is among the very best. Reliable and durable in the coldest of cold climates. BD is my go-to for hardgood gear!

Beefy Biner

  • Familiarity: I've put it through the wringer

My favorite biner for belaying and rapping because it can take so much rope wear because of how solid and thick it is.

Love This Locker

    The size of this thing is awesome. Its my favorite locker, durable, consistent, good hand feel.


      This is so big and strong that there is no reason to worry about it breaking!

      Rock solid

        I use this to attach my belay devices to my harness, works great and feels solid


          Can't go wrong with this oversized locking carabiner, it gets the job done.


          • Familiarity: I've used it several times

          Great heavy locking carabiner but not too heavy


            These have become my go to for building TR anchors. They're stout, sturdy, on the heavy side but appropriate for the job. When I asked a guide I took classes with what to buy, these are what he uses and recommended.

            Good Aluminum Screwgate

            • Familiarity: I've put it through the wringer

            This carabiner works great for anchor building, rigging, belaying, and pretty much any use you would have for a locking carabiner. It is not the lightest aluminum carabiner out there, but for most cases the weight does not even matter. While not as strong as a steel carabiner, I would still recommend this carabiner for many rigging applications and attaching gear to your main attachment point. The wide basket and gate opening allow for many strands of rope/prusik cord/webbing to passed through it.

            For Belaying

              I bought this for belaying indoors and it's been great.

              Industry Standard

              • Familiarity: I've put it through the wringer

              This is the great carabiner its always been. Classic shape and smooth design, its reliable and sturdy. Screwgate is easy to open and close. It's not the lightest weight biner, but you can't go wrong with some of these at this price.

              Great Carabiner

              • Familiarity: I've put it through the wringer

              A great standard carabiner. Nothing fancy but it does everything you need it to. No real bells or whistles. Just a good functional carabiner.

              The standard

              • Familiarity: I've put it through the wringer

              While the Petzl William biners are better quality the price difference makes these the backbone of every climbers rack!

              Thanks for this review and comments, John.

              Great Carabiner

                Big enough, strong enough. Brought these to the crag and they held, were easy to handle, easy to clean. Colors are nice. They are what they say they are