Check the listing for details. Stainless Steel 304 Round Recessed Door Lock Hidden Cup Pull Knob Black. Condition: New. Listed at 39.03 USD. SizeThe round recessed door handle diameter is 74 mm/ 2.9 inch. and its screw installs center hole pitch is 42 mm/ 1.65 inch. Suitable for 35-55 mm/ 1.38-2.16 inch thickness door panel.Durable Steel MaterialThe hidden door lock is made of 304 stainless steel material, which is anti-rust, not easy to fade after long-term use, comfortable to touch, durable, and has a long service life.Double-sided handle designThe handle can be turned inside and outside to close the door, but it is not can be locked for doors. A small latch can be installed inside if it is installed on an outward-opening invisible door. Both sides have a handle design that can stand up, and the rotatable handle can be hidden in the center of the door handle, which is simple and elegant.Easy to Install and UseThe invisible door lock is installed with the provided bolts.