Edge Mount Mounts the actuator at the trailing edge of the plane, requiring 4" less transom height than standard mount Trim tabs make the single most important difference in the way your boat rides and performs. They are optional on some boats but should be as standard as power trim and tilt. Lenco trim tabs make your boat ride smoother, drier, faster and with increased safety whether on a small skiff or a mega-yacht. Lenco"s ballscrew design is more reliable, three times more powerful and features an instant response, which makes them very user friendly compared to typical hydraulics. We also like being oil-free and environmentally conscious. Instant response electric actuators for precise control Everything is fully submersible, maintenance-free and sealed for life Self-locking ballscrew will not drift, even while backing down 12-gauge (2.6 mm) laser cut stainless steel trim tab planes High-impact corrosion-proof mounts look great through years of abuse Clean, time and space-saving installation Actuators have high-impact, 50% glass fiber-filled, ultraviolet-resistant nylon case 316 super buff stainless steel rams Each Kit Includes: 2 Actuators 2 Stainless steel trim tab planes All stainless steel mounting hardware