Tremors 3: Back to Perfection (2001)
Tremors 3: Back to Perfection is a 2001 direct-to-video western monster film directed by Brent Maddock, and is the third installment in the Tremors series featuring the subterranean worm-creatures dubbed "Graboids". It is a sequel to Tremors 2: Aftershocks. Michael Gross, Charlotte Stewart, Ariana Richards, Tony Genaro, and Robert Jayne reprise their roles from the first film.
More at Wikipedia.