Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Amerock BP4424-RBZ Rustic Bronze Cabinet Hardware Handle Pull - 3" Hole Centers - 10 Pack
Product description: Amerock BP4424-RBZ Rustic Bronze Cabinet Hardware Handle Pull - 3" Hole Centers - 10 Pack
Product feature: High Quality Rustic Bronze Finish, Hole Centers: 3", Overall Length: 4-1/8", Width: 13/16" --- Projection: 1-1/8", Individually Polybagged with 1" Mounting Screws Included
Product price: $52.49
Product brand: Amerock
Target attributes: Knob Shape
Answer: attribute: knob shape
value: None
source: None