MUL-T-LOCK's Cronus cylindrical locksets are designed to provide superior door protection with uncompromised key control. Each Cronus Lockset is fitted with a MUL-T-LOCK Key In Knob and available in a Knob (Ball or Plym) Design or ADA (America Disabilities Act) Compliant Lever Design. Various functions are available for just about any need. Like all MUL-T-LOCK Products, the Cronus line of Locksets is protected by MUL-T-LOCK's Limited Lifetime Mechanical Warranty.