The specification indicates that the solenoid is a 3-pole, 12-volt model. It features an upper stud thread size of 5/16" and a lower stud thread size of 1/4".
The 3-pole configuration refers to the number of wires or connections the solenoid has, which would correspond to how it interfaces with the mower's wiring harness.
To ensure that your machine will function properly, please verify the model number and part number of your machine before ordering parts.