The grades of three machinery stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

Luxfer Holdings PLC Sponsored ADR (LXFR) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. Luxfer Holdings, a materials technology company, engages in the design, manufacture, and supply of materials, components, and gas cylinders. In Portfolio Grader’s specific subcategory of Equity, LXFR also gets an A. The stock has moved up a slight 2% over the past week. Shares of the stock have been changing hands at an unusually rapid pace, up 561.5% from the week prior. For more information, get Portfolio Grader’s complete analysis of LXFR stock.

WABCO Holdings (WBC) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Wabco Holdings manufactures and sells control systems, including advanced braking, stability, suspension, transmission control and air compressing and processing systems, that improve vehicle performance and safety and reduce overall vehicle operating costs. The stock’s current price of $106.80 is approaching the 52-week high of $109.00. For more information, get Portfolio Grader’s complete analysis of WBC stock.

American Railcar Industries, Inc. (ARII) is seeing ratings go up from a C last week to a B this week. American Railcar Industries designs, manufactures, and sells hopper and tank railcars in North America. For more information, get Portfolio Grader’s complete analysis of ARII 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.