1、Puller Function: The battery terminal puller makes it easy to remove the battery terminal cable, preventing damage to the battery terminals. 2、Available Sizes: Puller jaws fit under cable terminals, center screw pushes down on post to pull terminals up, durable hardened jaws open 1/4in to 1‑1/8in to fit most battery terminals. 3、Terminal Wrench Usage: 5/16in x 10mm terminal wrench is used to remove or install 5/16in side terminals, also used to remove or install 10mm battery terminals and retaining fasteners. 4、Terminal Brush Purpose: Remove corrosion and dirt from battery terminals and cable clamps with this durable steel brush. The outer brush cleans the cable clamps and the inner brush cleans the binding posts. 5、Nut Pliers Function: Nut plier is used to easily loosen and tighten nuts on battery terminal clamps, the handle is offset, suitable for working in narrow areas, and the jaws are serrated for a firm grip.