Recommended Door Specifications: Thickness: Recess Mount-for AHS-20, 22.5 mm (7/8") for AHS-24, 27 mm (1-1/16"), Surface Mount-for AHS-20, 19.5 mm (3/4") for AHS-24, 24 mm (1"), Width: Max. 450 mm (17-3/4") Height: Max. 700 mm (27-9/16"), Weight: Max. 2.6 kg (5.7 lbs) per pairWARNING: This product can expose you to lead, 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.