This 1U Vented Rack Mount Filler Panel With Hinged Side Is Reversible. The Hinged Side And Holding Side Can Be Assembled Together With The Middle Patch Panel According To Your Own Usage ( Hinged Side Can Be Left Or Right). After Installing, You Can Open From The Holding Side And The Hinged Side Will Move Front & Back For Easy Access & Maintenance. Br>Product Size: 1U, 19 Inches Width Including: 1 X Main Panel 1 X Holding Side 1 X Hinged Side 4 X M4 Screws For Assembly