Designed to close with spring tension when hinge is back-surface mounted Lift pin for easy door installation and removal Torsion moment (Hinge closed): .76 kgfcm (.66 lbin) per piece Door Weight: Max. 2 kg/pair (4.4 lbs)WARNING: This product can expose you to chromium, nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65WARNINGs.ca.gov.