Single Cylinder (158, 258, 993, 980, 780, 660, 816, B60, B250, JD60) - is operated with a key from the exterior and a thumbturn from the interior.
Double Cylinder (159, 994, 985, 785, 665, B62, B252) - is operated with a key from both the exterior and interior.
One-Sided with Plate (667, B81) - is operated by thumbturn on interior. Blank plate on exterior side.
One-Sided (663, B80) - is operated by thumbturn on interior. No trim on exterior side.
Exterior Plate (664) - converts a 663 to 667 when door is bored through.
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