A product of Dennis Brothers of Guildford, the "Z" type was a heavy single-cylinder 600cc Blackburn-powered roller mower typical of that company's products. It was made both before and after World War 2 and, although not suitable for rough ground, it was ideal for flat surfaces such as cricket pitches where its weight ensured that it rolled the ground as well as mowed it. Because of its power and weight, it was best used with a trailing seat. One example, which left the Guildford works in May 1948, bears the serial no. 299Z7. Replaced by the 10 hp. "Premier" in the 1960s.