THE LENSE GLASS IS APPROX 4" DIAMETER
Housing is stainless steel Boat is 12V so this is too The base has some sikaflex around it and a little splash of paint but basically the unit seems in excellent condition
BUT
I cannot test it so not guarantees
The nearest unit I have found online is a 5" unit that is remote control and has an SRP of circa £700 plus
So grab a bargain