Professional Tool Manufacturing, LLC stands behind the quality of all products, and warrants that such products are free from defects in material and workmanship and that these products will perform as intended when used correctly and in compliance with all safety warnings. The warranty of quality for Drill Doctor is valid for 3 years and Work Sharp for 2 years from confirmed receipt of purchase. Accessories and Attachments for Drill Doctor and Work Sharp products are not warranted items. However, Professional Tool Manufacturing will evaluate any product defect claims. For further information or for service, please contact Professional Tool Manufactoring at 1-800-597-6170.