Mon Cala crabs functioned as repulsorlift restraints on the planet of Mon Cala. They featured an eight-sided base and a split hexagonal top, incorporating two pincer arms designed to secure a prisoner's limbs. In the course of the Battle of Mon Cala, Riff Tamson employed a pair of Mon Cala crabs to immobilize Senator Padmé Amidala along with Junior Representative Jar Jar Binks.