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  • With magnetic arms in the gate and a steel insert in the nose rather than a twistlock or screwlock, the Magnetron 'biner is simple to operate and totally secure
  • Both magnetic arms must be individually depressed before the gate can open, to prevent accidental openings
  • Once open, opposing magnetic fields repel the arms to ensure smooth and reliable gate operation
  • Symmetric design lets you open the gate easily with just 1 hand, either your right or left
  • GridLock design features an extension at the bottom of the gate to keep the 'biner properly oriented on your belay loop to avoid cross loading
  • I-beam spine transitions into a rounded rope-bearing surface for smooth belaying and rappelling
  • Hot-forging process allows the metal to be moved around and formed into intricate shapes; these shapes can ease handling and reduce weight
  • Keylock nose won't snag on pro, ropes or slings, making the 'biner simple to clip
  • Magnetic arms on the gate come in assorted colors only; sorry, specific color requests cannot be accommodated


View all Black Diamond Carabiners

REI membership


Best Use Climbing
Carabiner Type Locking Carabiner
Gate Type Auto-lock
Gate Open Clearance 21 millimeters
Strength Major Axis Closed 22 kilonewtons
Strength Major Axis Open 8 kilonewtons
Strength Minor Axis 7 kilonewtons
Dimensions 110 x 65 millimeters
Weight 78 grams
Rated 5 out of 5 by from Favorite Belay Biner This carabiner is by far my favorite for belaying. The magnets are fail-safe, and having my belay loop separate from my device gives me so much piece of mind! Pros: -Will never cross load if set up correctly -Easy to use, doesn't take much time. (Unlike screwing and unscrewing a traditional gate.) -Looks cool! (Mine is silver with the blue magnets) Cons: -The lockout part of the arm is great, but if you do have someone belay on it who loads it wrong it WILL break. The first time. Immediately. This is what happened to my first one and I bought another because it is so good!
Date published: 2017-02-13
Rated 4 out of 5 by from It works, but awkward I'm very excited for this stealthy looking addition to my rack! Pros: - It is almost impossible to stop it locking when you remove your hands (hint: squeeze the magnets into their beds when the gate is open to make the carabiner lock gate-open) - Nice to save time on screwing in the gate - It looks cool - Definitely stops cross-loading Cons: - Because it's so good at locking, it's quite awkward to get the belay loop into the protected section. It's also awkward to get the rope into the belay device - you end up unlocking it three or four times to set up a belay - Heavy - Not smooth and round for the rope to run over (e.g. vs Petzl Attache) - Not useful as a general biner
Date published: 2016-11-09
Rated 5 out of 5 by from Good security The grid is perfect, no need to worry about the carabiner. Not that quick to unlock if using a GriGri, but you get use to it
Date published: 2017-06-14
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When will this carabiner be available?

Asked by: Chadpilot
Please contact us directly at (800) 426-4840 for more information about backorders.
Answered by: REIservice
Date published: 2016-09-30

Hi REI, the color description says "blue" - does that mean it's a black carabiner with little blue locking magnets? 

Asked by: Danny44
Yes, we are carrying the black Magnetron GridLock Belay Locking Carabiner with blue accents.
Answered by: REIservice
Date published: 2016-05-27
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