Milwaukee tapped power resistor. 4 connections, 3 sections: 0.25-.50-.25 for total of 1ohm.
Max power 100W when mounted on a 10"sq. X .040" thick plate. Sand potted metal case with .250 Quick connect male terminals.
L: 4-9/16" W: 3/4" H: 3/4" (Body) WT: .24