19' shelf perforated 1U Patent: PUV 2012-25430. Accessories pack Screws M6 x 10 (for 150 and 250 mm – 4x) - 8x plastic washers (for 150 and 250 mm – 4x) - 8x cage nuts M6 (for 150 and 250 mm – 4x) - 8x screws M5 x 12 (for 150 and 250 mm – 4x) - 8x Rear bracket (at 150 and 250 mm – 2x) - 4x