Made from solid wood and without finger joints, these museum-quality, heavy-duty 2-1/4"w x 1-1/2"d bars provide a very strong and stable frame for even the largest of canvases up to 144" in size. The tongue and groove components of the stretcher bar are a full 1/4" thick, provide maximum stiffness and prevent twisting. The ends of the stretcher bars feature a special tongue and groove miter making it easy to assemble a frame without staples or glue. The unique joint design makes it possible to expand the frame and re-tension a loose canvas. They are also equipped with a unique groove on the inner perimeter of the frame that accepts key-able braces and supports. These stretcher bars are made from solid-wood milled from sustainable forests in both Oregon and California. Each Bar comes with a pre-drilled 1/4" hole for pegboard display.