Chadwick & Trefethen Inc have been in the business of manufacturing quality hand reamers for over 100 years. Whether you have a need related to industrial, automotive, electrical or a specialty application. Chadwick & Trefethen stand by their product and offer a guarantee that each one will meet the necessary standards.Reamers are used to enlarge existing holes and smooth the finish. This requires precision as an exact fit is needed. Chadwick & Trefethen offers many types of reamers from adjustable reamers to pilot reamers to straight blade reamers.