In 1901, a small pattern shop known as the Collis Pattern Works was founded in Dubuque, Iowa. This was our beginning. For more than 100 years, we have continuously serviced the machine tool industry with a full line of tool holders. We are the only manufacturer to certify AT3 or better holders. Collis Toolholder Corporation is ISO compliant. This registration supports our Mission Statement to be customer need-driven and devoted to improving productivity in the metal working industry. We design and manufacture each of our tool holders to precision tolerances, maximizing repeatability, accuracy, and durability. Collis Toolholder Corporation will continue to be the leader in our industry and have committed ourselves to a higher level of customer service performance and as always, to be the best. We are the only US manufacturer that carries a full line of tool holders where you can one stop shop for all your needs.