You might also need
Questions & Answers (1)
Q: What is the difference between a double cylinder and a single cylinder?
Asked by: Mark Bayless - 02/21/2017
A: A single cylinder will have a key on the exterior and a turn piece on the interior. The double cylinder requires the use of a key on both sides of the door. The single cylinder is the more common application.
Answer provided by: Marc - 02/21/2017