HxWxD are dimensions of the product. Top: 450x150 mm. Upstairs: holder 2 x quarto (2xA4) Inner dimension holders: Height 225 mm Width 223 mm Depth 25, upside 30 mm Discount 5 % for purchase from 5 pcs, discount 8 % for purchase from 10 pcs. DOWNSTAIRS: holder 8x 1/3 quarto (A4) Inner dimension holders: Height 170 mm Width 110 mm Depth 25, upside 30 mm. The holder is designed for wall mounting.