PETZL Spirit Screw-Lock Carabiner H-shaped cross section provides improved strength-to-weight ratio. Wider contact surface allows for better rope glide and reduces wear on the carabiner. Screw-Lock locking sleeve is easy to use and effective. Visual indicator lets you know at a glance whether the biner is locked or not. Adapted shape allows for easy tying or untying of a clove hitch. Keylock system eliminates the risk of snags. Major axis strength: 23kN. Minor axis strength: 8kN. Open gate strength: 9kn. Gate opening: 18mm.