1. Materials 
   1) Body             : Zinc alloy
   2) Fixed Bracket : Steel

2. Finish    
   1) Body             : Chrome Plating
   2) Fixed Bracket : Zinc Plating

3. Features
   1) The key is separated from the body at only one point.
   2) The rotation angle is 180 degrees.
   3) The exterior is neat because there is a cover on the key hole.

4. Shape and size 

Please refer attached files.