Privacy FunctionThe crystal door knobs can be locked using the thumb button function from inside, and be unlocked from the outside with Allen key in emergency. Without keyThe glass door knobs doesn't have a keyed cylinder, not for use where keyed security is required. Ideal for bathroom/bedroom. Adjustable LatchLatch can be adjusted to 2-3/8 or 2-3/4 inch, fit all doors 1-3/8 to 1-3/4 inch thickness. Easy to InstallNo need for professional door fitters, you can do it yourself. After-sales ServiceFor any order with quality/quantity issues about glass door knobs interior, we provide refund or replacement.