Maruyama M-Twist is a revolutionary new trimmer head brought to you by Maruyama, a manufacturer of top-quality outdoor power equipment used by professionals worldwide. The M-Twist is designed for cutting grass and weeds with nylon cutting line on a trimmer or brushcutter. It features a visible wear bar near the eyelets, indicating when the cover needs to be replaced. The M-Twist is easy to install and use. Simply place the head onto the gearcase of your trimmer or brushcutter and tighten the bolt and nut firmly. To advance the line, simply bump the head on the ground at approximately 4,500 RPM rotation speed. The M-Twist will automatically advance the line, so you can keep cutting without interruption.