YakAttack GTSL90 GearTrac - The GTSL90 surface mount track is similar in size and shape to the GT90, but is made from a high end, super strong polymer. Designed for light to medium duty applications, the single GTSL90 kit comes ready to install and includes either a 4", 8", 12", or 16" track, drilled and with hardware. The optional FullBack backing plate provides easier installation and increased security. Want to add some style to your rigged platform? Super high end polymer is designed for harsh marine environments Compatible with 1/2" wide track hardware Hole spacing 1-3/4" 12" long U.S. Pat. No. 9,671,060 B1