Our Metal frames have room for artwork up to 1/4in thick. This includes matting, so if your frame has a single mat the artwork shouldn’t exceed 3/16in thick and if it is double matted the artwork shouldn’t exceed 1/8in thick. The spring clips that hold your art into the frame will adjust perfectly as long as your art doesn’t exceed this thickness. Our Wood frames have room for artwork up to 1/8in thick if they have no mats or one mat, and up to 1/16in if they have two mats.