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  • DMM Boa HMS Screwgate
  • DMM Boa HMS Screwgate
  • DMM Boa HMS Screwgate

DMM Boa HMS Screwgate

This is the ‘Big Daddy’ of Lockers.

£15.04 was £16.00 you save £0.96 (6%)

This 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, but the story doesn’t end there.

Despite its name, the Big Boa is surprisingly light; by giving it an I-Beam construction we’ve reduced the overall weight by almost 25%. Add in the fact that it is easy to handle in gloves and the appeal to winter climbers is obvious.


  • Large clean nose HMS locking 'biner.
  • Ideal for rigging; can accommodate multiple knots.
  • Large gate opening.
  • Easy to handle in gloves.
  • Strong I-Beam construction to save weight (almost 25% reduction).
  • Strength (Gate Closed) - 25kN.
  • Strength (Gate Open) - 8kN.
  • Strength (Minor Axis) - 10kN.
  • Gate Opening - 25mm.
  • Weight - 83g.