What type of conductor grip is utilized to pull conductors through blocks or travelers?

The Kellum grip is specifically designed for pulling conductors through blocks or travelers. This grip features a unique construction that allows it to securely hold a conductor while facilitating the smooth movement needed when pulling it through various types of supports or structures. The design ensures that the conductor remains firmly in place without damaging it, making it ideal for applications in electrical work, particularly in settings where conductors must navigate through intricacies of rigging.

Other grips, while potentially useful in other contexts, do not provide the same functionality. For instance, a gripper might be more general-purpose, lacking the specialized design intended for directional pulling. Similarly, a clamp is typically used to secure an object in place rather than facilitate movement through obstacles. The holdfast, while useful in certain securing tasks, doesn't match the specific need for conductor traversal as outlined in the question. Hence, the Kellum grip stands out as the appropriate choice for this particular application.