A unique and most ideal all-purpose pneumatic hacksaw. Its reciprocating blade is designed to cut any sawable material of any shape. Its automatic lubricating system will not produce either heat or sparks on the blade and material to be cut. This safety saw can be used even in places where flammables are prohibited such as tankers, chemical plants, and petroleum refineries. This pneumatic saw is rust-proof and water-proof. Thus it can also be used for under water work.