Insta-Trim boat levelers are made of 12 gauge 304 stainless steel and guaranteed against electrolysis. A 12 volt kit includes motor with a thermo-overload, pump with a built in by-pass, and epoxy-sealed solenoids for locking tabs in position. Also included is a protective cover with a transparent reservoir, hydraulic lines, cylinders, brackets, rocker type switches, wiring, stainless steel mounting hardware, and two stainless steel tabs with hinges. Tab depths are available in 8 and 11 inch chords; lengths vary depending upon the length of the boat Dual cylinders are standard for 46 to 72 inch tabs Twin outboard and I/O kits are appropriate only for low-displacement cruisers in the size ranges indicated; for heavier cruisers in a given size range, choose an inboard system Note: ** two hydraulic cylinders per tab