Here's what other sites are saying:
An innovative specialty carabiner with an integral pulley for minimizing rope drag.
Haul gear or conduct rescues in which safety and legislative compliance are required with the versatile Revolver Locksafe 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 locksafe mechanism - making it ready for use when belaying as well.
- Mountain Gear