I love ornate door knockers.  Everyone that comes to our house comments on ours (it's a rabbit) so I was ecstatic when I found this gorgeous lion.  Ornate and substantial.
 
This vintage brass/gold lion is metal based, and weighs in around 3+ pounds.  It doesn't come with the hardware but (3) screws are needed to attach to your door.  
 
Approx:  8" long and 5" wide