Usage: Steel Door Technicial Specifications: *Magnetic protection and impact sensor against unusual impacts and forced opening of the door *Alarm volume up to 105 decibels *Easy battery change *Easy montage *Galvanized monoblock body *HOK Type patented steel hook mechanism with 3 turns of 15 mm thickness *HOK Type hook resistance opening up and down against door forces *Chrome nickel plated steel mirror *Steel tongue with chrome nickel plated *Precision internal mechanism *Bearing sleeve bearing *High Security Cylinder with 5 keys (BB.68)