A popular medium-duty door closer, fully power adjustable, suitable for general commercial applications, apartment entrance doors, office interiors, factory partitioning etc Figure 66' bracket included for parallel arm fitting, Full fitting instructions included Suitable for 30minute and 60minute fire doors Power adjustable, sizes 2-4 by 'valve' which means the power size is adjusted by adjusting a small screw in the unit of the closer. This means you can fit the closer and adjust the power size easily, to suit the width/weight of the door Adjustable Backcheck and Delayed Action included on this unit