A de-hiding tool for use in slaughter houses in which a spring biases the reciprocating cutting blades into intimate facial contact to prevent debris from entering the driving mechanism, but achieves long life and low maintenance by interposing a low-friction element between the biasing spring and the nearest cutting-blade face, such element and the spring being carried in one cover of the tool coaxially with the cutting blades, the low-friction element being movable towards the nearest cutting-blade face under pressure from said spring, the tool being capable of adjustment to optimum operational speed by reason of an adjustable needle valve carried in the air channel to the tool.
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