Ignition starter switch has 4 stud terminals and a mounting stem 7/16" long and 3/4" in diameter. Comes with 2 brass keys and 1-1/8" mounting nut. Fits panels up to 5/8" thick. Alternate part numbers: Sierra 8-UN12140, SIE_UN12140, SIE-UN12140, SIEUN12140, 47-UN12140