SE170/250TC, 24V, Twin Five-Blade Props Counter-Rotating, 374lbs Thrust w/Centa CouplerSide Power SE170 250TC, 24V, Twin Counter Rotating Prop, 374 lbs. of Thrust. Typically fitted to boats from 50 70'. Other items to consider when purchasing a new thruster: Bow Tunnel or Stern Tunnel Control Panels and Remote Controls AutoMainswitch, Battery Disconnect, Fuse & Fuseholder 4 Wire Harnesses (when not using AutoMainswitch) 5 Wire Harnesses (for use with AutoMainswitch)