Here's what other sites are saying:
Haul gear or conduct rescues in which safety and legislative compliance are required with the versatile Revolver Quicklock carabiner from DMM. You'll have an efficient pulley system with a 7075 series pulley positioned at the top of the biner while the gate employs the quicklock mechanism - making it ready for use when belaying as well.
- Mountain Gear
The DMM Revolver Locking Carabiner features an integrated pulley to reduce rope drag on a meandering rock pitch or reduce friction from your crevasse rescue system. Popular among search and rescue personal, this unique carabiner reduces the number of pulleys needed in complicated hauling and lowering systems. You can also use this DMM carabiner to take the sting out of that one mandatory piece of protection that's five feet outside the rope line.
An innovative specialty carabiner with an integral pulley for minimizing rope drag.