... ,such as photo frame,showcase,light box,exhibition booth,sign panel,sign light box,display rack,bulletin board,decoration edge and their material ... of the aluminum in 45 degree and connect them.back board/front board:≤2mm thicknessiron connector:L40*10*2mm&L60*15*2mmspring ... once,resonable price and technical help is waiting for you. led light source aluminum extrusion for ...