Leg leveler used on most newer driving games. 1/2"X 13 Thread, 3" long sold without locking nut. Also used in Aliens Armageddon 55" Deluxe; Big Buck HD/Safari/Pro Open Season Super Deluxe/World Deluxe; Terminator Salvation 42" Deluxe; Wheel Of Fortune Deluxe/Video; Aliens.