DMM Big Boa HMS I Beam Keylock Carabiner for Sale, Reviews, Deals and Guides

I've used the carabiner about 5 times now and I love it. The large size allows for easy clipping on to my harness and the look is very sleek. I recommend this product.

Purchased the Locksafe and Quicklock. I wanted to get that security that it would close sufficiently and easier versus a screwgate. Though all of them do the job. The difference: The Locksafe has pull and twist mechanism whereas the Quicklock has the twisting component only. Love the quicklock. I feel safe and it is really easy to use. The locksafe is nice, but a bit tedious on top of routes if your hands get a bit tired. I would recommend either for sure but the quicklock is my go to.

I'm real happy with the Big Boa as the workhorse on an anchor's masterpoint, especially in aid/big wall scenarios. The size of this thing lets you clip many systems into the master without getting too cluttered. Everyone else is right though - its I-beam shape isn't the best for rappels - If you're looking for a big rap 'biner, go with a Rocklock or something else with a round profile.

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.

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.

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.

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.

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.

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