Features: • Convertible from external to internal pull - each item makes 2 pullers. • Self-locking jaws hold puller in place for one-hand operation. • Interchangeable parts allow tremendous variety of applications. • Jaws are forged for maximum strength and durability. • All pullers are easily assembled without the use of other tools. • Curved anvil heads on the pressure screw allow use of hammer to “shock” frozen gears and pulleys. • Pullers are compatible with slide hammer sets 87016, 87017, and 87018, simply match the correct pressure screw size.