Easier handling: - sheave mounted on sealed ball bearings for excellent efficiency - gate opening on the non-pulley side, to facilitate installation on devices - Keylock system prevents any accidental snagging of the carabiner when putting the pulley in place H cross-section of carabiner: - ensures an improved strength-to-weight ratio - protects markings from abrasion - SCREW-LOCK: the manual screw-lock with red band provides a visual warning when the carabiner is unlocked