Blac-Rac 18in T-Channel Mount Black/Gray. It can be mounted horizontally or vertically to any flat surface. If you're mounting in your vehicle we recommend either a 10 or 18 T-channel depending on the space you have available. If you're mounting in your home we suggest using an 18 t-channel so you can connect your Blac-Rac to two lateral studs. Specifications for Blac-Rac T-Channel Mounts: Manufacturer: Blac-Rac Application: Car Color: Black/Gray Fabric/Material: Aluminum Features of Blac-Rac T-Channel Mounts Attach your Blac-Rac to your vehicle or walls. This T-channel can attach vertically or horizontally to any flat surface. Package Contents: Blac-Rac T-Channel Mounts Blac-Rac 25018: 18in T-Channel Mount Black/Gray