This pair of 18U 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 on These rack-mount rails are made of 0.12 inches (3.0 mm) thick SPCC steel, with black powder coating, are strong and durable More sizes are available, from this 18u rack rails to 2u 4u 6u 8u 10u 12u 14u 16u rails No 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 alignment The package comes with 2 pieces of rails and 1 pack of mounting screws RIVECO 18U round holes rails Categories: rack accessories Model size: 18 U  2 pieces as one pair wood screws included  10-32 screws included Features: 3.0 mm thickness are ideal for heavy load Tapered holes for screws easy in out Versatile: Compatible with19-inches network equipment like NAS, server, router, patch panel, PDU UPS Also fit stereo application scenarios, like sound recording, music band, DJ mixing, AV, home theater, home lab