Fulcrum - the axis of rotation. This explains LOCK's newest shelf system user-friendly assembly. Place the shelves and the sides, than rotate the middle bar to lock the elements. You can assemble and disassemble multiple times. No instruments required. No screws, no bolts! The perfect modern nomad match. Signed by Maker,Labeled by Maker,Stamped by Maker,Labeled with Country of Origin,Numbered