The Petzl Sm'D is a locking carabiner that is lightweight, compact, and can be used in numerous situations; it is easy to manipulate, even when wearing gloves. This is the screw-locking version.
The screw-lock is easy to open and allows locked or unlocked operation. The red band provides a visual warning when the carabiner is unlocked. This system is suitable for difficult environments where contaminants (mud, ice) could cause an automatic locking system to jam.
The gate and screw lock have a rounded shape and Keylock mating system to eliminate any snag points.