Satin Nickel Round Cavity Privacy Sliding Door Lock with Snib I MuchelnThis Satin Nickel Round Cavity Sliding Door Lock with Snib is ideal for rooms requiring privacy, such as bathrooms and ensuites. The turn snib allows you to lock the door from the inside with an emergency release on the outside for peace of mind. Suitable for doors up to 45mm thick, the required cut out size through the door is 50mm. If you are replacing an existing door handle it is recommended that you check the existing cut out size on your door.