Abstract: A holder for a retractable cutting tool holder and which includes a housing having a bore within which is provided the retractable tool holder with its operative end extending therebeyond, a piston member in the bore operatively engaged with the retractable holder, adjustable means for setting the stroke of the piston and thereby the cutting depth of the work tool, and air pressure passageways in communication with opposite sides of said piston for selectively advancing and providing support for the work tool and subsequently simultaneously removing said support and retracting said tool without leaving tool witness marks on a work piece.