The patented Grippall™ CNC Bar Puller an inexpensive machine tool used to automate any CNC Lathe with coolant or air on the turret. As coolant is fed through the unit, it pushes a piston forward which causes the fingers to grip the bar stock. When the coolant is turned off, the fingers will automatically spring open. No adjustment is necessary within the entire gripping range. Pressure ranges 15 psi. to 140 psi. max.