The Cast Aluminum Boot Instep Stretcher and Vamp Raiser is a high performance professional device that stretches the instep and vamp area of your boots. If you have a tight fitting, uncomfortable boots this cast boot stretcher is perfect for you. Provide yourself with more room in the most difficult-to-stretch part of your boot. This heavy duty cast aluminum device is equipped with a screw mechanism that allows you to apply just the right amount of pressure to stretch your boots.