The grades of 4 Commercial Services & Supplies 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.

This is a strong week for UniFirst Corporation (UNF). The company’s rating climbs to B from the previous week’s C. UniFirst Corporation provides workplace uniforms and protective clothing, including shirts, pants, jackets, coveralls, lab coats, smocks and aprons and specialized protective wear, such as flame resistant and high visibility garments. For more information, get Portfolio Grader’s complete analysis of UNF stock.

Cintas Corporation (CTAS) gets a higher grade this week, advancing from a B last week to a A. Cintas Corporation provides uniforms first aid items, and other products to businesses. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of CTAS stock.

KAR Auction Services, Inc. (KAR) shows solid improvement this week. The company’s rating rises from a C to a B. KAR Auction Services, Inc. provides wholesale vehicle auction services in North America. For more information, get Portfolio Grader’s complete analysis of KAR stock.

CECO Environmental Corp.’s (CECE) ratings are looking better this week, moving up to a B from last week’s C. CECO Environmental Corp. provides air-pollution control technology products and services worldwide. The company also gets A’s in sales growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CECE 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.