Feature●The Sta-Rat tandem pin marker is a great way to measure the distance you need to slide the tandem axle●No need for a spotter to help you out●Place the pin marker on your trailer at your target pin hole location, now you can see it from your rear mirror while you move your tractorDescription A marker that you can easily see from your rear mirror, make it easy for you to know when to stop when you slide the tandem