Generally chamfers cost less to machine than radii on outer horizontal edges. Some notable tool functions include&colon; walls, arcs, chamfers, fillets, spline curves, perpendiculars, and tangents. The windows have simple chamfers on the outside with no further mouldings. Also, the chamfers are quite symmetrical in a Simon bow. The arches of the aisle arcade have double chamfers. This tool drills, chamfers, and threads a hole all in one compact cycle. In the chapters below the chamfers of the five Platonic solids are described in detail. Gimson's distinctive use of gentle stopped chamfers evokes the framing of Gloucestershire wagons. Chamfers are commonly used in architecture, both for functional and aesthetic reasons.