Manufacturer's Description

Visit DMM's Big Boa HMS page.

Retailers' Descriptions

Here's what other sites are saying:

The DMM I Beam Boa Locksafe autolocking carabiner opens its jaws wide to handle big loads of webbing, ropes and pro.


Accommodate whatever belay setup you want with the Big Boa HMS IBeam Keylock Screwgate Carabiner from DMM that has an offset opening which can easily accept a lot of rigging. With high core strength and snag-free keylock opening, this do-it-all locking carabiner is perfect for all your climbing needs.

- Mountain Gear

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.


The DMM Big Boa is a carabiner that belongs on everyone's rack. Belay, rappel or rig, make sure you never leave ground without it.