This excerpt taken from the GWW 10-K filed Feb 28, 2005.
NOTE 6CONCENTRATION OF CREDIT RISK
The Company places temporary cash investments with institutions of high credit quality and, by policy, limits the amount of credit exposure to any one institution.
The Company has a broad customer base representing many diverse industries doing business in all regions of the United States as well as other areas of North America. Consequently, no significant concentration of credit risk is considered to exist.