Stan is correct. It's a handle to lift a 6V golf cart battery. I have four Trojan 6 volt batteries in my '77h30. The reason I use GC batteries is that they are built heavy, hold 225 amp hours each and last a long time with proper care. I generally get up to 7-9 years of service from them. One negative is their height, but four fit comfortably in the compartment under the port quarter berth. Cable two in series and you get 12 volts with 225 ahs. I have two sets of 2, 6 volt batteries going to their own selector switch. I can switch between house 1 or house 2 or combine both for 450 ahs. This selector switch is connected to the #1 selector switch on my panel. # 2 is for the starting battery which is a 12 volt. With this configuration, I can run either or all house, just starting, or combine all batteries if needed.
Fairwinds,
Roland