Mechanical limit motors utilize a proven, reliable technology and have evolved to become some of the most reliable products on the market today. Fitting tube sizes 35mm to 55mm, LiftMaster^TM offers a complete range of motors from 10Nm to 100Nm. Motors are also available with an emergency hand crank. All LiftMaster^TM mechanical limit motors are compatible with LiftMaster^TM electronic controls. Central or single point operation, residential or industrial, LiftMaster^TM has a motor to do any job.