Secure your auxilliary outboard motor with these quality stainless steel motor locks. Fits over the thumb screws of the motor attachment clamps, so they can't be undone. Stainless steel lock and 35mm I.D stainless steel tube for high corrosion resistance. Two keys are included. uits most electric trolling motors & small outboard motors to 7.5 HP, Tube length: 200mm, Slot length: 170mm Secure your auxilliary outboard motor with these quality stainless steel motor locks. Fits over the thumb screws of the motor attachment clamps, so they can't be undone. Stainless steel lock