Black and decker cm100 city mower base is a 3 in 1 string trimmer deck that has a lightweight wheeled base which allows you to use your strimmer like a mower for easier and more consistent cutting over small turfed areas adjustable wheels allow you to easily change the height of cut either 40 60mm it is lightweight and portable so it is easy to carry and use on uneven ground and steep inclines features a unique click and go system so that the string trimmer simply clicks into the base enabling