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Give yourself space to lock into your belay station with the Rocklock.

The Black Diamond Rocklock Twistlock carabiner is one of Black Diamond's largest locking biners. The new Keylock has a non-snagging keylock nose. A slightly curved spine maximizes the gate opening and a square hinge end holds your belay loop securely in place. The Rocklock's large size makes it an excellent choice when using two ropes, wearing gloves, or when using a variety of belaying and repelling techniques. Its large capacity can handle multiple clove hitches at belays. It's easily operated with one hand. –Vendor

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4 2
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Black Diamond Rocklock Carabiner

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Here's what others have to say...

5 5

Cheap and reliable

Not the lightest carabiner, but its also not the smallest. Ample space to clip in and really easy to use with gloves on in the winter. The price is right.

5 5

Big, easy to use, pocket friendly.

  • Familiarity: I've used it several times

It is a big biner that is easy to use. It is pocket friendly. There is a reason you see a ton of them connected to a belay device. Unless you are an ounce counter or need to have the newest or most exspensive stuff, just buy it.

4 5

Good Big Biner

  • Familiarity: I've put it through the wringer

It is a nice size for a belay carabiner. I keep a figure 8 and an ATC guide on it and can still put a clove hitch on there while belaying. However, its not really any stronger than the much smaller and thinner positron locker. I would think that the beefier size would make it stronger. Must have something to do with the tensile strength of the aluminum regardless of thickness.

5 5

My goto Belay biner

  • Familiarity: I've put it through the wringer

Love this carabiner. Lots of room for any rope. Very trustworthy as a belay workhorse. Highly recommend.

5 5

Great heavy duty locker

  • Familiarity: I've put it through the wringer

These are great for Heavy duty work like Belaying, Top Roping anchors, etc.

5 5

Great for everything perfect at nothing

  • Familiarity: I've put it through the wringer

These biners are the standard. I use them for anchors, belays, whitewater taglines, live-bait rescue tethers, even carrying my keys when I have to retire one. Don't expect it to excel at anything, they weren't built for that. They were made to be the majority of lockers on your rack, not all of the lockers. They are great, inexpensive biners for setting up systems and no rack is complete without a dozen.

3 5

Beefy Locker

  • Familiarity: I've put it through the wringer

Big locking biner. Use them exclusively for top rope anchors due to how cumbersome they are. Would not use them for much else.

5 5

All Around Good Locker

  • Familiarity: I've put it through the wringer

If you are looking for an all around good locker then look no further. For the price this locker is fairly good. No complaints yet with it but then again I usually just use it for an anchor so I don't get to see it in action all that often.

5 5

Nice, roomy belay biner

Locking is smooth and easy to open/close. Bought this with the screw gate for belaying. It has lots of room and works great. Good value too!

4 5

Good for the price

For the price, you can't beat this biner for what it brings to the table. The screwgate spins cleanly and its a sturdy beast.

That said, it is relatively easy to crossload while on belay if you aren't watching your gear, especially on routes that create slack then create loads. I have also had the screwgate loosen on me once as well, so now I make sure to torque it down before giving the thumbs up.

Overall pretty good, could definitely do worse.

5 5

My belay bener

  • Familiarity: I've put it through the wringer

Wayyy better then the triact-lock biner or any with a 3-point lock system! Easy to open and good size. Usually it's kept on my harness as a belay biner but could be used on directs, I don't just for added safety. Strong, reliable, big gate, good size. Overall my favorite twistlock bener out there

My belay bener
4 5

great for belays

  • Familiarity: I've put it through the wringer

greast carabiner to use as the center point of the belay station, or to use with and ATC or reverso as the round edges helo the rope move better
not the lightest, not the heviest

5 5

Great all around Locker!

  • Familiarity: I've put it through the wringer

I've been using this biner for many years and Is always my go do to locking biner. It is affordable and dependable! Get it know while it is on sale!

5 5

Solid and Big

  • Familiarity: I've put it through the wringer

This was my primary belay carabiner until I discovered the Gridlock. Mine is the screwgate rather than the twistlock.

The Good:
--It's huge; if it can't fit what you need to feed through it you should probably reconsider what you're hanging off your carabiners.
--Solid, smooth, reliable gate action and a locking sleeve that resists the sandy goodness found at so many crags.
--Super smooth belaying.
--Easy to slide ropes, hitches, runners, etc., around the spine thanks to a smooth profile.

The Bad:
--It's quite large. So large that it can be a liability at space-tight anchor bolts. For those I prefer the Positron Screwgate.

Overall a great carabiner. Between this and the Positron locking 'biner there's not much you can't do.

5 5


  • Familiarity: I've put it through the wringer

Great carabiner, does what you need it to do!

5 5

Works as advertised

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

Been about a month, smooth action, no issues. I'd recommend it.

View all contributions... Be patient, it might take a while.