This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.

If you disable this cookie, we will not be able to save your preferences. This means that every time you visit this website you will need to enable or disable cookies again.

Cookies help us deliver our products and services on this site. By using our site, you agree to our use of cookies. Learn more.

Our new program makes it simple, convenient and predictable to ship your Rowley® products. Small orders that fit into the listed FedEx One Rate® envelope, pak or box will ship 2nd Day Air. Shorter products, pending dimensions and max quantities, will ship ground with a flat rate per box fee. After a certain box quantity, ground shipment orders will adjust to LTL to save on fees. This program applies to all orders shipped within the U.S.A.

If you need to see how drill bits sizes compare in the different measurement scales we have a link to a Drill bit size chart / drill bit comparison chart

This website uses Google Analytics to collect anonymous information such as the number of visitors to the site, and the most popular pages.

JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Drill bit sizes not only vary in diameter but in length also. Furthermore there are a number of different scales used for measuring the diameter. They include Metric, Imperial, Wire No./Letter and Decimal.