Channel 1/16 Inch Thick 72 Inch By 1/4 Inch Width Mill Finish Aluminum. Designed for trim work, frame work and reinforcement projects. Often used to fit a plywood edge where the plywood thickness matches the channel width dimension. Channel width dimension is a fraction for the thickness of plywood. Although designed to be a plywood trim, also popular for wire protectors, trailer hitches, door framing, pipe hangers and other projects. Aluminum is light weight, yet strong, withstanding heavy pressure and loads. Aluminum can be bent or formed into a multitude of shapes.