The do it all locker, in a good size and weight. Can't go wrong with BD for quality and performance. I'm using two of these on a pair of BD slings for sport cleaning and I have a couple more for assorted anchoring uses.

I picked up 4 of the BD Positron Screwgate biners and absolutely love them. They are very light-weight and versatile for anchoring systems. The Key Lock is great as webbing and pro will not snag when engaging the biner. The Screwgate works nicely. It is worth noting that these are essentially the same as the BD Locking Quicksilver Biners, but those do not have the Keygate feature. Also, I would point out that this is a relatively small locking-biner. I only use it for setting up anchors (e.g., clipping bolts for top-rop set-ups) or as a locker on the end of my personal anchor system. It is definitely too small to use as a belay locker, and I think Rocklocks or other larger locking biners work much better as master points (for running the rope through or for locking multiple webbing, etc into).

I have used this biner in pretty much every situation possible-on rock, in the rain, buried in the show, in single digit temps. It has performed beautifully every time. I've never had the lock or gate freeze shut on me even when my friends biners are completely iced up. Add this to the light weight and you never need another locker!

Bomber, the classic design got updated with the new keynose for snag free unclipping. carabiner perfection

very functional and smooth. all my buddies and i have this in our rack.

These 'biners are great. I have the majority of my lockers as the Positrons, with just a Vaporlock as a belay 'biner. They have a very smooth gate action, I have never had troubles with clipping. The gate screws easily and fast, and is never a problem for beat up or pumped hands to work. They are bomb proof strong, I use them to build top-rope anchors mostly, but also to secure a belay and I also keep one on my PAS permanently for cleaning. The size of the 'biner limits its uses a bit, just not really enough room for a doubled rope for the rappel. And if you belay on a tube, not the best I recommend the Vaporlock, but it's fine with a GriGri. I love to keylock nose, never snags on runners, and makes clipping to bolts easy. My partner has only 1 or 2 of these, and mostly uses a combo of the Quicksilver Screwgates, or a DMM keylock, and he tells me he prefers my Positrons.

As far as I can tell, the coloured ones I have, with the copper-brown anodized coating has 3 different coloured gates, yellow green, orange, and the same brown, just if anyone is interested.

Hard to improve on these guys.

I love this biner. The key lock style makes it fast cliping and un-cliping from anchors. I use these on top anchors and my daisy cahins. they do not snag like the standard biners with the hook on them. I recomend these any day.

Iam a big fan of the key lock style biners, I keep getting any thing with a notch snaged of stuff. These are a bit small for belaying with but for anchors and clipping in to stuff these are one of the best I have foud. I use them for top rop anchors and belay station anchors and for my p.a.s. I recommended these any time.

A very samll and light carabiner. I have 3 or 4 and love to have them on my trad rack for building anchors. But not the greatest for using with the rope, like rappeling or belaying. (its possible though)

I keep one of these permanently attached to my PAS (Metolius' version of a daisy chain) and use it frequently. The keylock gate is extremely helpful when things get messy at the anchor. This also works great when building anchors.

best small locker i've used. i keep two on my Metolius PAS. at least 4 on my trad rack. if you need a locker, you can't go wrong with this one.

These are great light weight biners that are not too pricey, perfect for everything you need a small locker for.

Smooth biner! Very safe and strong with the screw lock!

Great carabiner for a decent price. The keylock feature is pretty nice, as it never snags. It seems to be pretty light and well built.

the perfect size for clipping into a bolt hanger at a fixed belay or any other anchor system...could be lighter but still the perfect size

I got these to replace my BD Quicksilvers for tethering at anchors. I am no longer engaged in all out hand-to-hand combat with the setup when I am ready to unclip and rappel down or be lowered now that I don't have an evil little notch catching on everything. If you like your Quicksilvers, but don't like the way they catch, this is your biner!

If you're looking for strength and quality....look no further....hands down the shizzle for your rack.

Excellent COMPACT locker for anywhere you need to use one! I stress compact because the size is perfect to keep a few onhand and ready.

Got a few of these for my PAS and anchors in general and they are great. Easy screw action, keylock is great and they are light as a feather (for a locker that is). I picked up a few of the Quicksilver lockers as well and you can tell the better quality. They are a little pricer than other options, but I have been happy with mine.

I really like this ‘biner. And the reason I like it so much is that it is about half the size of my other locking ‘biners. I use it on my GriGri, and it works great, but it’s probably too small for a BD when you are using two ropes.

Nice, compact ‘biner with screwgate locking and keylock design. About the same size as a regular positron ‘biner. Perfect if you want a less bulky or lighter ‘biner that can still screw closed. Also, keylock makes it harder to snag on ropes, pro, etc. Another solid ‘biner from Black Diamond.

A very fine piece of climbing equipment. The only regret I have after five days of climbing out in the glacier is that I only took two of the 'biners with me. Should've had at least six...

perfect for anchors (as others have said already), for your rappel autoblock, etc... keylock nose is the number one feature - no snagging is just beautiful!! ...and so it the mocha finish

This is a must have for your daisy chain due to the smooth mouth. It is a solid carabiner with the easiest maneuverability of anything I have seen. Quit wasting valuable time and energy at the top trying to clip into the anchors.

A good biner, easy to use for clipping in to a belay device or station.

Does the trick, just big enough to use it to belay if you needed to. Solid and versatile smaller locking biner.

A great biner if you're looking for something which is lightweight but not miniature and something which is sturdy but doesn't weigh almost as much as your harness. It's nose ensures that nothing ever gets caught, allowing clipping and unclipping.

Perfect for rigging and any need that this small but trusty carabiner can fill.

A good choice if you want a locker that is small. Keylocks are the only type of carabiner I buy anymore, not having the nose snag on things is great.

Excellent for boating towables (rope connection to boat). Quick, easy, strong, safe...love it!

the Black Diamond Positron Screwgate Carabiner is a biner that i can trust with my life. it is simple but also a strong biner. AND light-weight.

The perfect all purpose size, smooth locking and keylock noise!!! Nuff said.

I love the key lock unfortunately most of my biners don't have the feature. Save yourself some grief and spend the extra to get the keylock. I keep 2 extra of these with my climbing stuff at all times.

It is what it is. A locking carabiner with a keyhole that won't snag on anything. Good bang for the buck.