The ProMAXX PlierPull Locking Plier Adapters are designed to produce greater pulling power thanks to their quick slide hammer connectivity. They're ideal for repairs where a high level of force is needed, such as for popping out cotter pins, pulling bushings, seals, and other applications. The threaded adapters are available in four sizes (3/8”, 5/8”, 5/16”, and 7/16”) to easily attach to the most common varieties of locking pliers and slide hammers. The adapters are lathe-turned and knurled from hardened steel and black oxide coated to protect against corrosion and wear. Made in the U.S.A.