The Petzl Sm’D Triact-Lock Carabiner is a D-shaped locking carabiner that is lightweight and compact and can be used in numerous situations; it is easy to manipulate, even when wearing gloves. The Triact-Lock gate is an automatic locking system with triple-action gate opening.

Petzl Sm'D Triact-Lock Features: 

• Highly versatile:
  - D shape is functional regardless of orientation, meeting multiple uses: attachment of a belay system, a pulley, or on the end of a lanyard...
  - compact and very lightweight
• Easy to use and ergonomic:
  - D shape for good handling
  - H-shaped cross-section contributes to better grip when wearing gloves
  - Keylock system helps avoid any involuntary snagging of the carabiner
  - hole allows a TIBLOC or a MICRO TRAXION to be connected to the carabiner with a cord, making these devices loss-proof

Specs: