DPDT (Double Pole, Double Throw) momentary switch. 

Includes two nuts, one lock washer, and one white nylon washer.

AC125V 4A, AC250V 2A

Body Depth 0.713 in.
Body Width 0.555 in.
Bushing Length 0.465 in.
Chassis Hole Diameter 0.5 in.
Contact Resistance 50 mΩ max
Electrical Life 20,000 make and break cycles at full load
Insulation Resistance 100MΩ minimum @ 500 V
Item Height 1.878 in.
Metric Thread Major Diameter 12 mm
Metric Thread Pitch 0.75 mm
Operating Temperature -20°C to 65°C
Rating @ 125 VAC 4 A
Rating @ 250 VAC 2 A