the size of profile ,frame mouldings
Finish Black
Width 3 15/16"
Style Traditional
Height 2 1/4"
Rabbet 1 1/8
i am working for an import company.when i browsed a website of a foreign company that produces frame mouldings,i saw these information of frame mouldings that i displayed above.i don't quite undertant them,could you explain them?

Question

the size of profile ,frame mouldings
Finish  Black 
Width  3 15/16"  
Style  Traditional 
Height  2 1/4" 
Rabbet  1 1/8 
i am working for an import company.when i browsed a website of a foreign company that produces frame mouldings,i saw these information of  frame mouldings that i displayed above.i don't quite undertant them,could you explain them?

Answer

The with (or distance which it projects away from the wall) is almost 4 inches.  You could just say 4 inches.
The height, (or the distance down the wall it projects) is 2.25 inches.
There is a grove (likely a 90 degree cut) called a rabbet along the middle.