Abstract: Adjustable ratchet pliers having jaw members that can be easily and rapidly adjusted to accommodate different size workpieces and in which one jaw member includes a slide track with a sunken area located along an elongated slot and the other jaw member includes a slide member that carries a locking means. The slide member has a portion which slides within the sunken area to keep the locking means in the proper position to provide a smooth action of the plies during adjustment.