The Matco Tools 2-pc Indexing Gear Puller Kit, No. MST52, allows users to index into position and stay in place with the ability to support the puller and quickly connect each jaw one at a time to the pulley without help due to the leg's indexing jaw design. Jaws are made of CR-MO with a chrome finish. The center screw is made of carbon steel with a black oxide finish. Users can convert between a two-leg and three-leg puller and reverse the jaws from external to internal style. The jaw operating range for the 2-ton puller is 1/2" to 3", and the 5-ton puller is 1" to 5".