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: Pointed Oyster and Clam Knife Opener German Made by F. Dick
Product description: The only tool you'll ever need for shucking oysters and clams. This is the finest clam and oyster knife money can buy. * Specs - Dimensions: 2"L blade.
Product feature: 2" Blade., The perfect tool for shucking oysters., Works great on clams too!, Utensils are the perfect complement for every kitchen., Riveted handle.
Product price: $41.71
Product brand: F. DICK
Target attributes: Set Size
Answer: attribute: set size
value: None
source: None