A basic web frame consists of a front rail which is usually visible from the front of the cabinet and two side rails which extend from the front to the rear of the cabinet. In many web frames, these side rails also serve as the drawer runners, on which the drawer itself slides. An optional rear rail may also be included.
In fine cabinet work, the front rail is connected to the sides of the cabinet, or to vertical frame members, using sliding dovetails. In solid timber carcases, the side rails are housed in a dado in the cabinet sides and fixed only at the front to allow for seasonal movement. A screw in an elongated hole is used at the rear in such cases to hold the rail in position, whilst allowing for movement.