0.5 increments per adjustment toward to rear. Cable entry: 1.25"x6.25" with brush x 4 (2 at top and 2 at bottom). Optional castor is available Optional cooling fan is available. The item "19 Inch 18U 500mm Deep Wall Mount Network Cabinet Rack, Glass Door withlock, Black" is in sale since Sunday, November 30, 2014. This item is in the category "Computers/Tablets & Networking\Enterprise Networking, Servers\Racks, Chassis & Patch Panels\Rackmount Cabinets & Frames".The seller is "powerrack2829" and is located in Chino, California. This item can be shipped worldwide.