These 21”self-propelled aluminum mowers are new products developed by WEIBANG , and which have a 53cm working width and 7 levels height adjustment from 25~76mm.They are available with a choice of Briggs & Stratton 675 Series engines which provide ample power for highly efficient performance.The mower's light aluminum chassis have a perfect aerodynamic design. These mowers are equipped with drive speed adjuster. You can operate a lever on the upper handle conveniently to get different drive speed to suit your mowing work.