Double end tenoners (DETs) are used for the squaring, sizing, edge profiling and edge sanding of panels. They are also used for dimensioning the length of sticks (solid lumber) generally used in the window, door and furniture industries. The material is generally transported through the machine on precision tracks, adjustable for width, past several working stations each side which can include a combination of saws (hogging heads) to cut to length, shapers to edge shape, Tenon heads to tenon, dado heads to apply top or bottom surface grooving and either straight or profile sanders to finish panel components or the ends of sticks. The sanders can be either disk or belt units. There are also specialized DETs that process the ends of furniture components producing round or oblong hidden tenons. DETs are usually used by medium to large processing factories.