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Description

A big, burly biner for busy belays.

The DMM Big Boa HMS I Beam Keylock Carabiner is a big, bad belay biner for when you need a combination of low weight, high strength, and huge capacity. The I Beam construction gives the Big Boa one of the highest strength ratings out there, and its keylock nose eliminates rope snags.

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DMM Big Boa HMS I Beam Keylock Carabiner

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Here's what others have to say...

5 5

Light. Roomy. Safe.

  • Familiarity: I've put it through the wringer

Like most things, there are specific tools for specific jobs--the DMM Big Boa is my go-to tool when I need a biner with a huge carrying capacity, easy gate, and relatively lower weight. Right now I have one of these on my rack, but I'm looking to pick up a couple more. This guy ends up serving as the powerpoint on most of my anchors, and while I have rappelled on it in a pinch (buddy's got my belay biner, etc), I don't typically rappel too often on it... any i-beam biner won't do as well as a solid-stock as far as durability is concerned, but like I said--different tools for different jobs.

at $12.72 right now, it's a total steal.

2 5

No so great rappel binner

  • Gender: Male
  • Familiarity: I've put it through the wringer

Personally I think the Quicklock DMM Big Boa is the best rappel binner on the market. It is very roomy and fits a lot of ropes. It is easy to open and close with both left or right hand.

Locksafe is a little bit awkward and hard to operate with one hand.

If you are ready to invest $20 in rappel/belay locker just get DMM Big Boa Quicklock.

BTW, Black Diamond Rocklock is a close competitor with much better price tag. If you are on a budget or if you already have Rocklock you do not really need this binner.

upd Jun 5th, 2013. After couple months of intensive usage my Boa got really grooved. Much worse then my BD Rocklock in several years. Thus I decrease rating from 4 stars to 2 stars. Probably 1 start would be more adequate for this metal quality.

Responded on

Try investing in a little rope wash next time, especially if you climb on sandstone.

Responded on

An inherent disadvantage to I-beam construction vs the Rocklock's solid bar. I don't know if its fair to blame the metal quality when there are so many other factors. Like Coldfinger above indicated, your rope's condition may have changed between when you used the Rocklock and switch to the DMM.
But it is worth noting that skeletonized or I-beam biners will wear worse than solid bar construction. Something to consider when looking at lightweight biners.

Responded on

Thnx for the input Aaron.

FYI, the only thing have changed after I switched to Boa is that I began to wash my ropes about two times more ofter - it was a natural reaction to increased binner wear. Unfortunately it did not help.

5 5

Nice and roomy

If you want lots of room for anchor building, this makes a great biner, and the screwgate comes at a reasonable price that is competitive with the identically sized Petzl William. The DMM Locksafes tend to carry a huge price premium, and you might as well buy the Petzl William Tri-Act.

This carabiner's basket size is almost identical to the Petzl William carabiner, and weights are similar. If you need to do some rigging with multiple hitches and ropes, this kind of carabiner is indispensable. If you climb in the winter, size does matter!

The strengths listed by Backcountry do not agree with DMM's website. The numbers are 25kN, 8kN (open gate), and 10kN (minor-axis).

This is a great carabiner. But so is the Petzl William. You can't go wrong with either.

5 5

Favorite carabiner!!

I've been using this biner for belaying for the past couple seasons and I must say, this thing is DURABLE. I've had a fairly insignificant amount of wear from the rope, even with moderate-heavy use in the past 2 years.
It's huge so the belay loop on my harness feels as if it's angel hair pasta when I'm all hooked up. I have the auto-locking (double action) version with the red gate, and I can open it really easily with just one hand.

This is such an amazing belay biner and I will surely buy another one once mine is worn out.

Responded on

I forgot to mention that while belaying, I've never gotten this biner in a cross-loading situation. It ALWAYS has stayed in place without rotating!

5 5

Solid

I got this primarily for my top rope anchor. It's built more beefy than my BD rocklock and rated for 4 more kN. Also, I got this 'biner in the quicklock version which is great for teaching newbie friends how to belay. The spring loaded locking action takes that tiny bit of doubt out of my head. A small note is that this is difficult to open one handed, as the gate lock must first be pulled up before twisting, but as I got this to use for a top rope anchor and belaying, this is actually preferable to me.

5 5

great opening

As a carabiner on your harness this one is huge and has a great big opening. It makes it easy to use.