Today the McMaster-Carr catalog is of course online, featuring hundreds of thousands of items. In attempting to explain to a layperson what McMaster is, I alternately described it as “Canal Street in the ’90s,” “The world’s largest hardware store that always has what you need” and “Amazon for the things you don’t typically find on Amazon.” Initially aimed at folks working in MRO (Maintenance, Repair and Operations) fields, the company, which has been around since 1901, has also become the go-to for makers of all stripes. Centrally located in Illinois, McMaster-Carr also has distribution centers in New Jersey, Georgia, Ohio and California, resulting in next-day arrival practically no matter where you are in the U.S.