Abstract: The invention hereof provides, in a single device, means for accepting and breaking chains of different sizes, from small chains to large, industrial type chains, the device accepting a plurality of drive blocks with outwardly projecting parallel ejection pins of differing sizes and/or spacings to accommodate to chains of different sizes, and accepting a plurality of chain nests of different sizes to receive the pins of a cooperant drive block while holding the chains of a cooperant size thereby permitting the ejection of the roller pins from the chain whereby the chain is "broken" or disassembled.

Abstract: The tool functions as a vise and comprises a ratcheted gear train within a housing, first and second longitudinally-opposed, laterally-spaced upwardly-extending fingers of crooks facing each other, the first crook being fixedly secured to the housing, the second crook being tethered to one extremity of a traveling cable driven longitudinally through its connection to the gear train, the first crook being positionable for bearing engagement against a selected section of the chain, the second crook being positionable for bearing against another selected section of the chain, thereby tensioning the portion of the chain not between the crooks and effectively relaxing the portion of the chain between the crooks.