This pair of 6U server rack rails are designed for DIYER to screw or anchor to the Wood cabinets or concrete walls, to mount studio or networking equipment, like AMP, recording devices, PDU, routers, 19-inches servers, patch panels and so onThese rack-mount rails are made of 0.12 inches (3.0 mm) thick SPCC steel, with black powder coating, are strong and durableMore sizes are available, from this 6u rack rails to 2u 4u 8u 10u 12u 14u 16u 18u railsNo rack unit number marks on rails. Considering the flexibility of installation, vertical or horizontal, forward or backward, using the unit separation triangle mark is a proper solution for alignmentThe package comes with 2 pieces of rails and 1 pack of mounting screws