D shape is particularly suited for connection to equipment such as descenders or positioning lanyards.
Aluminum carabiner is light, reducing the weight of equipment the worker at height needs to carry.
May be used with a CAPTIV positioning bar to favor loading of the carabiner along the major axis, to limit the risk of it flipping and to keep it integrated with the device.

Easier handling:
Fluid interior design limits the risk of having a catch point and facilitates rotation of the carabiner
Keylock system to avoid any involuntary snagging of the carabiner

H-shaped cross-section:
Ensures an improved strength-to-weight ratio
Protects markings from abrasion