Medeco³ Key-in-Knob cylinders are designed to retrofit knob type cylindrical lock sets, lever type cylindrical lock sets, padlocks and bored type auxiliary dead latches and deadlocks. 20 series, Key-in-Knob cylinders are UL437 listed for drill and pick resistance, and the those that incorporate the Medeco³ design, offer utility patented key control.

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http://www.medeco.com/en/site/medeco/products/kik/