Motion Pro is dedicated to producing the most versatile, unique and durable products for professional and home use. Motion Pro tools are designed to be simple to use, yet durable enough to withstand the harshest conditions. One of their goals is to offer tools of convenience. Do it right the first time with Motion Pro Tools. Manufactured from 0.052-inch thick aluminum with a 6-3/4-inch outside diameter and a 6 mm center hole. Blue anodized finish with easy to read numbers. Check or set ignition and/or cam timing. May be used on 2 and 4-stroke engines.