This week, the overall grades of 4 Metals & Mining stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Handy & Harman Ltd. (HNH) gets weaker ratings this week as last week’s C drops to a D. Handy & Harman Ltd. produces steel products, roofing supplies, and metal joining products. The company also gets F’s in earnings growth. For more information, get Portfolio Grader’s complete analysis of HNH stock.

This week, Ampco-Pittsburgh Corporation (AP) drops from a C to a D rating. Ampco-Pittsburgh Corporation is engaged in manufacturing and selling custom-engineered equipment in a global marketplace. The company also gets F’s in earnings growth. For more information, get Portfolio Grader’s complete analysis of AP stock.

Slipping from a C to a D rating, Nevsun Resources Ltd. (NSU) takes a hit this week. Nevsun Resources Ltd. is a gold producer and base metal developer. The company also gets F’s in sales growth and operating margin growth. For more information, get Portfolio Grader’s complete analysis of NSU stock.

A. M. Castle & Co. (CAS) slips from a D to a F this week. A. M. Castle & Co. provides a range of products and value-added processing and supply chain services to customers that are primarily in the producer/durable equipment sector of the global economy. The company also gets F’s in sales growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CAS stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.