Features: Safe clamping function and securance of the minimal insertion depth due to the ad- justment stroke limitation of the adjustment screw. Large adjustment stroke of the adjusting screw. No invasion of chips, dirt or coolant due to closed clamping circuit. Due to special design of the clamping bore insensitiv to oily shanks. Due to stroke limitation of the clamping screw no risk of overexpansion of the ex- pansion sleeve. Ideal central coolant supply via central hole in the adjusting screw. The fully enclosed tool shank in the clam- ping bore allowes no loss of coolant. The centrical clamping of smooth cylindrical shanks guarantees the highest concentricity and repeatability of 0,003 mm. Safe torque transmission even at high speeds.