Thank you for viewing. This is an overseas-made floor hinge that was stored in a factory. It's a fairly old product, but it's unused. Cover plates are not included. There were no visible oil leaks, but the functionality is not guaranteed. I think it's a rather rare item. Please consider it as junk. The DORMA BTS 75 is a **floor spring (floor hinge)** manufactured by Dormakaba. This is a device for automatically closing doors, installed by embedding it in the floor. Details about the product are as follows: Main Features and Specifications Brand/Model Name: DORMA BTS 75 V floor spring. Application: Compatible with single and double doors, and can be used in a wide range of applications. Functions: Adjustable spring force: The spring force can be adjusted according to the weight of the door. Closing speed adjustment: The closing speed can be adjusted separately in the range of 180° to 70° and 70° to 0° (as indicated on the package in the image). Concealed installation: The main body is hidden under the floor, so it does not spoil the appearance. Non-hold open: This type does not keep the door open (the product in the image may have this specification). Compatible door weight: Supports doors up to 120kg. I am committed to a pleasant transaction. If you have any questions, please comment.