Rattleware 6 by 5.5 by 4-Inch Knock Chute Open bottom knock chutes allow for under counter grounds disposal All knock chutes are made from heavy duty stainless steel featuring a welded metal bar for strong sides Each knock chute has a replaceable rubber bar cover and an edge gasket made of molded rubber Knock chutes are designed for commercial use Knock Chute cut out dimensions are 5-7/16" x 5-15/16"