Alligator saws

Alligator

— a peculiar modification of reciprocating saws (see the relevant paragraph). Alligator tools have two blades moving back and forth in antiphase: while one blade moves forward, the second one goes back. Due to this, the accuracy and safety of work are noticeably increased — the mutual movement of the blades reduces the risk that the saw can be taken to the side. On the other hand, the kerf is wider and the tools themselves are bulkier, heavier and more expensive than reciprocating saws.