Window Trim Corner Blocks Shown in front in photo. Ten pieces per order. These are like rossetta and go at the top corner of a door trim instead of a miter or header. Each piece is beveled and measures 3/32 x 1/2 x 1/2 (4mm x 12.7mm x 12.7mm). Made of basswood and ready for the finish of your choice after a light sanding.