We are dedicated to bringing you high-quality products and providing the answers you need to complete your project. If you need assistance, check out our information links on this website: Frequently Asked Questions - for answers to installation and operation concerns. Installation manuals - Yale® offers animated installation manuals online.Warranty - Yale® Lifetime Limited Warranty with a Total Satisfaction Guarantee. Terms and Conditions of Sale Do you have a question or concern? Contact Yale® Customer Service for assistance at 1-800-438-1951, or contact our Customer Service via email at service@yalelock.com.