Electromagnetic Lock, Surface Mount, Opening Action Electromagnetic, Aluminum, Amp Draw @ 12V 0.50, Amp Draw @ 24V 0.25, Input Voltage 12/24V DC, Features Surface Mounted for Single and Double Outswing or Inswing Doors, Total Projection (In.) 1 1/4 in, Holding Force (Lb.) 650, Lock Body Length (In.) 10 1/2 in, Lock Body Width (In.) 1 3/4 in, Lock Body Depth (In.) 1 1/4 in, Mfr. Series 2500, Instantaneous Release Delay, Brushed Aluminum Finish, Standards cULus Listed