Power resistor with a maximum of 50W. 3,9R 5% tolerance. To work with 50W you need an additional heatsink, without heatsink this resistor is rated at 20W.
Mounting hole distance H: 39,7mm
Mounting hole distance J: 21,4mm
Length L: 51mm
Width N: 30mm
Total length M: 72,5mm
Diameter mounting holes: 3,3mm