The main style characteristics of English lantern clocks are similar to its Continental relatives: a wall clock with square bottom and top plates surmounted by a large bell, four corner pillars, a series of vertical plates positioned behind each other and a 30-hour movement with one or more weights. At the start of the 17th century, the style gradually evolved to a standard to which all clockmakers more or less complied. The guild supervised the clockmakers, who were compelled to work within a prescribed method. Suppliers to the clockmakers' trade contributed to this general style as well. For example, the brass founders supplied stylistically identical clock posts to several clockmakers. In contrast to the Dutch variants, such as stool clocks, English lantern clocks were entirely made of metal (brass and steel).