Picture frame components include frame sections each having a channel and communicating cavity that are open at the rear of the frame. At least a region of each frame section adjacent the cavity is deformable and defines a deformable bearing surface. At each frame corner a bracket is provided to hold two adjoining frame sections together. The bracket has two legs with an engaging member on each leg that presents an engaging wall for being received in the frame section cavity and for engaging the deformable region of the frame section. Either the engaging wall or bearing surface, or both, are angled relative to the frame section length. The bracket is inserted in the channels of the adjoining frame sections and each frame section bearing surface is deformed by the engaging wall as the frame sections are forced tightly together.