The YakAttack Backing Plate Upgrade Kit is intended for those who purchased the basic YakAttack LeverLoc Anchor Trolley kit but now want to upgrade to a heavier duty install. The backing plate is designed to work with the YakAttack Stealth Pulley, other popular anchor trolley pulleys, and LeverLoc Clamp Base. Requires inside hull access. The use of a YakAttack Rigging Bullet, RB1032, is highly recommend for installs where the install location is out of arms reach. YakAttack Backing Plate Upgrade Kit Features: Stealth Pulley not included Includes backing plate and necessary hardware for installation