Sierra STT3231R Edge Mount 12" x 12" Electric Trim Tab KitThe Sierra Edge Mount Trim Tab feature built in electronics with position sensing and CAN communication. Constructed of 12 gauge 304 stainless steel with a high quality electro-polish finish for extreme durability in marine environments. 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. An auto-retract feature activates in situations such as shift moving to reverse. This kit comes with an adaptive dial controller that features an LED display for easy reading.Trim Tab Kit Includes: 2.25" Standard Trim Tab Actuators; Trim Controller; Wiring Harness; 12" x 12" edge mount trim tabs; 316 stainless steel hardware; Trim Tab Features: Trim Tab is 12" Wide by 12" Deep; Electronic Shift & Throttle systems; CAN Communication; Position Sensing; Adjustable Pitch and Roll Control; Auto-retract;