Bennett Trim Tabs x 12 Standard Trim Plane Assembly 18. Each trim plane assembly includes a trim plane backing plate and hinge for one side of the boat. Bennett Marine's TPA1812 Trim Plane Assembly is 12" x 9". The Trim Plane Assemblies are available in a wide variety of sizes. Refer to manufacturer recommendations and installation guidelines to ensure a proper fit for your application. Specifications for Bennett Trim Tabs 18 x 12 Standard Trim Plane Assembly: Manufacturer: Bennett Trim Tabs Color: Black Features of Bennett Trim Tabs 18 x 12 Standard Trim Plane Assembly High quality 304 stainless steel Includes mounting plates trim plane backing plate and hinge Dimensions: 18" x 12" For traditional hydraulic trim tabs Strong and rigid even in the most challenging situations Package Contents: Bennett Trim Tabs 18 x 12 Standard Trim Plane Assembly Bennett Trim Tabs TPA1812: x 12 Standard Trim Plane Assembly 18