Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Aven 18403 Offset Curved Serrated Forcep with Alignment Pin, Stainless Steel, 6" Length
Product description: Use for bending, separating and removing small items. Offset curved serrated tip. Made of stainless steel. 6 inch length.
Product feature: Use for bending, separating and removing small items, Offset curved serrated tip, Made of stainless steel, 6-inch length
Product price: $7.01
Product brand: Aven
Target attributes: Grade
Answer: attribute: grade
value: None
source: None