This is the ProTek R/C Aluminum Chassis Ride Height Gauge. A well tuned chassis can be the difference between making the A Main, and making the podium. Don't let a poorly tuned chassis be the reason why you don't make it on the box! This gauge features a pivoting arm with lock screw, and graduated scale that measure from 3mm to 20mm in 1mm increments. The gauge is machined from aluminum for precision and durability, and the measurements are laser engraved on both sides for easy viewing. Combine this with black anodizing and aluminum beveled edges, and you get a highly functional setup tool that looks as good as it works. When it comes to high quality products that are backed by incredible customer support, ProTek R/C has you covered with the gear you need to keep your rig ready for action, no matter what.