One indexing clamp includes a mobile base having handle and fastening ends and locking jaws at the fastening end, an indexing post extending from the base, a shaft extending from the post, a primary prong having a cavity, and secondary prongs. A shaft diameter is smaller than a post diameter, and the shaft and post are coaxial at an axis. The primary prong is selectively positionable at first and second lowered positions and a raised position. The first and second positions are angularly offset from one another about the axis, and the primary prong is rotatable about the axis when at the raised position. A biasing member biases the primary prong away from the raised position. The post and the primary prong cavity are configured complementary to one another such that the primary prong is movable between the first and second positions only after moving to the raised position.
