Rennline's tie-down brackets are made of steel and powder coated red. These brackets are available in 66° to allow you to install these brackets in many different locations based on your specific needs. Mounting hole measures 16.5mm. This is the same dimension as most shock mount bolts and several other suspension components. The 66° tie downs are designed specifically for 996/997/Cayman and Boxsters with upgraded rear sway bars. Gt2 and GT3 cars will also use the 66° tie down. Red in color.