Where to Buy

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.


The DMM Big Boa HMS Screwgate is the 'Big Daddy' of lockers - the ultimate rigging biner and one which is super strong and super tough. It is large enough to accommodate several knots and has a very wide gate opening - just what you need in a rigging situation. All of which makes it a great centre use biner.

- 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.