Grivel’s long-awaited Twin Gate Carabiners are hitting stores as I write this post. The biggest retailers will get them first (read: REI), and soon the US will have as many as Europe.

The options will be the Mega K6G (two opposing solid gates), Lambda K7G (one solid and one wire gate, also keylock) and Sigma K8G (a smaller offset D version of the Lambda). Although there is no official locking mechanism, these are considered auto-locking carabiners (unlike the Rock Exotica RockD BiWire) as the carabiners will close and effectively stay locked thanks to their opposing gates.

Twin Gate Series
Size wise, Sigma : Petzl Spirit and Mega : Petzl Attache

Grivel already makes many other Lambda and Mega carabiners. All Lambda carabiners have the exact same body, same as all Mega carabiners. The ‘G’ in the model name (K7G and K6G) is Grivel’s internal code for gate type: Twin Gate Version.

The idea is that these 2 opposing gates create a safer, faster, and stronger carabiner. Taking the Mega as an example, you’ll see significantly different strength ratings for the different gate types (closed – open – minor axis):

  • Mega K6N (screw):               21kN – 6kN – 10kN
  • Mega K6T (std auto-lock):  21kN – 6kN – 10kN
  • Mega K6G (twin):                 27kN – 10kN – 10kN

Use and Conditions

Grivel says climbers will get used to this new gate action within a few minutes, and the reviews agree. One Mountain Project Reviewer says this about the Sigma K8G:

The biner fit and finish is top notch and feels very much like a Petzl Spirit and WC Helium had some weird love child…it really is almost as easy to clip and unclip into things as a normal biner…after maybe two minutes of messing with it I was clipping a bolt hanger from either direction with ease.

The Twin Gate carabiners are said to work better in icy winter conditions as they will not freeze shut like screwgates. And before you assume that these carabiners will not work with gloves on, Stevie Haston shows it’s “no problem” (video is queued to the glove demonstration at 2:41):

Comparisons to other Auto-Lockers

The most similar carabiners exhibiting a new take on auto-lockers would be Edelrid’s Slider Series (lighter, more expensive), Black Diamond’s Vaporlock (lighter, more expensive) and RockLock (heavier, more expensive), and Mammut’s yet-to-be-released Slidelock carabiner.

New Autolocking technology
Edelrid Pure, BD Magnetron VaperLock, Edelrid HMS Strike, Mammut Slidelock

Ranging between $15.95 – $17.95, the Twin Gates are by far the cheapest of all the newest auto-locking technology. And they’re even on the affordable-end compared with the entire auto-locking carabiner range: $12-$35. [See all the auto-lockers sorted by price on WeighMyRack.]

As for weight, the Sigma is within the top 10 lightest auto-locking carabiners, and the Lambda is in the top 15. The Mega sits almost squarely in the middle of the range of auto-locking carabiners for weight. [See every auto-locking carabiner sorted by weight at WeighMyRack.]

Auto-Locker Weight Comparison Graph

The reason the Mega is not heavier than most carabiners even though it looks like a beast, is because 80% of the weight of a carabiner is in the body. Since each of the Twin Gates are about half a gate each, the weight doesn’t add up quickly, and is similar to carabiners of the same size.

Problems Solved

  • No potential for back-clipping
  • Cannot accidentally unclip/unscrew
  • Fast to open (faster than a traditional screwgate)
  • Easier to use than most auto-locking carabiners with one hand and/or gloves
  • Easier to use one-handed and put something into the carabiner (like a clove hitch)
  • Stronger than most gated carabiners (because there’s two gates, and we all know two is better than one)

Best Uses

The Sigma K8G will excel as the “Jesus Draw” — a quickdraw that you cannot afford to have unclip.

Grivel claims the Lambda K7G and Mega K6G win in all situations vs a screw gate carabiner (belay, anchors) and they work perfectly in all other locking carabiner situations.

Reviews and Opinions

Dane from the Cold Thistle blog, usually a safe-bet to find curmudgeon reviews on gear, wrote his opinions about Twin Gates in April, 2014. After some first-hand experience, he touts:

The Twin Gate technology is the best “locking” biner yet designed, by a fair margin.

I’ve seen a lot of online debate contesting the usefulness of this carabiner, the naysayers claiming it’s a “gimmick” and a “solution to a problem that doesn’t exist.” Many folks are excited about the new innovation albeit a little hesitant to commit.

I agree that this debate is most similar to the question of an ATC vs GriGri. Is it necessary that everybody change over their locking ‘biner fleet immediately? No. Do Twin Gates assist in reducing risk? Yes. Is it worth consideration when buying lockers in the future? Yes.

And here’s where the retailers will start adding their Grivel Twin Gate offerings:

Alison Dennis

Alison Dennis

Alison (she/her) runs WeighMyRack from her 17' travel trailer. She is currently touring the US and would love if you contacted her to meet up to talk about climbing, climbing gear, or if you have any fun and/or ridiculous adventure in mind.

All author posts

We’re @weighmyrack


Get Climbing Gear News

You can expect 0 – 52 updates per year.

About Us

We’re a bunch of gear nerds who set out to level the playing field. Screw the media bias of marketing budgets, we treat all brands equally. You won’t find elitist or gatekeeping writing here, we welcome all climbers.


When we write specific place names we will give a land acknowledgement.
To avoid assumptions we’ll ask to share gender pronouns.

Our Location

We’re often mobile. Do inquire for a current shipping address.

Our business address is:
30 N Gould St
Suite 23131
Sheridan, Wyoming 82801

Instead of featuring distracting ads or creating a paywall to monetize our site, Weigh My Rack LLC links to relevent products via affiliate marketing (if you click a link and then buy, we get a commission). Weigh My Rack LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Weigh My Rack LLC also participates in affiliate programs with Avantlink, AWIN, Bergfruende, CJ, FlexOffers, Webgains, and other sites.