[Al Skierkiewicz]

First has posted the part number and functional equivalents. Yes they are solid brass and yes they are VERY HEAVY. As pointed out above, the #6 to #10 transition block needs to be wired between the main circuit breaker and the Maxi fuse block. Refer to the elctrical blueprint. Be sure to get the #10 wires connected to this block, in a good electrical contact. High resistance here means heat and a loss of power delivered to the motors.