A stepped, box-like frame with a flat panel that leads the eye to the painting. Made for canvas boards, aluminium panels and other rigid artwork up to about 5mm thick.
Two fitting styles
Modern float: Your board rests on the inner section with about a 5mm overhang, so its edges are on show and it appears to float.
Traditional inlay: Your board fits into the opening at the back. An MDF backing board and flexible points are included to hold it in.