Assemble with 3 jaws for maximum stability or with 2 jaws where access is limited 2-in-1 puller. Jaws, yokes and forcing screw made of heat treated chrome vanadium steel for ultimate strength. Reversible jaw design allows internal and external pulling. Jaws grip tighter as pulling force increases. All components hardened to HRC 42-45 for professional use. Fine-threaded 440 CrV forcing screw allows precise control for damage free pulling. Can be used with bearing separators.