The Rotatrim RC RCM20 Professional-20 (20" Cut) Rotary Cutter is robust, reliable, and compatible for use with rotary trimmers. It features a hand-finished tungsten steel flat construction, and the rotary blades offer accuracy. A solid laminated MDF girded baseboard with precision side rule and cursor provides accuracy in work. It offers a long duty life, and is virtually maintenance free. The self-clamping strip offers a clear view of the cut and enables you to secure the work in place. Featuring a twin chrome-plated steel guide rail design, the RC RCM20 provides complete resistance to the swivel cutting head.