This week, 4 Household Durables stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This is a strong week for iRobot Corporation (IRBT). The company’s rating climbs to A from the previous week’s B. IRobot Corporation engages in designing, developing, and marketing robots for the consumer, government, and industrial markets worldwide. The company also gets A’s in sales growth, earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of IRBT stock.

CSS Industries, Inc. (CSS) improves from a C to a B rating this week. CSS Industries, Inc. is engaged in the design, manufacture, procurement, distribution, and sale of seasonal and all-occasion social expression products. For more information, get Portfolio Grader’s complete analysis of CSS stock.

LaZBoy Incorporated (LZB) earns a B this week, jumping up from last week’s grade of C. LaZBoy Incorporated manufactures residential and office upholstered furniture. For more information, get Portfolio Grader’s complete analysis of LZB stock.

Hooker Furniture Corporation (HOFT) boosts its rating from a C to a B this week. Hooker Furniture Corporation supplies wood, metal, and upholstered furniture for various home applications. The company also gets A’s in operating margin growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of HOFT 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.