Made of high quality steel. To look greater and trendier, wooden panels can be fitted on. More adjustable shelves can also be added for your own preference. Additional steel panels at the bottom shelf are for ladies' protection. Dimension: Main unit (single side book racks): W958* D267/ 326 *H2020 W958* D267/ 326 *H1340 Extension unit (single side book racks): W933* D267/ 326 *H2020 W933* D267/ 326 *H1340 Main unit (double side book racks): W958* D482/ 580 *H2020 W958* D482/ 580 *H1340 Extension unit (double side book racks): W933* D482/ 580 *H2020 W933* D482/ 580 *H1340 The extension unit can be added on to the main unit to extend
