Safety brackets with 2 lugs and shelf support locking system. Can be assembled with all CLASSIC 50 wall uprights, steel shelf art. no. 10700, wire mesh shelf art. no. 10707 and with wooden and glass shelves in conjunction with singlesided clip-on holder art. no. 11604, double-sided clip-on holder art. no. 11612 and in addition, for glass shelves, suction pad art. no. 11605.