When supporting wooden shelves, locking brackets are used to fix the respective shelves to the crossbars. Four brackets are necessary for a stable fixation of a shelf. The locking angles supplied by TOPREGAL® refer to the TOPREGAL® crossbar thickness of 50mm. For the name-giving Shelf rack and at the Storage rack or the Pallet rack from TOPREGAL® the shelf consists of a chipboard (38mm). Alternatives are a steel plate (25mm) or a grating (mesh size of 9,9cm x 3,3cm).