The absolute highlight of the SPIRO and ->SUPRA drill chucks is the automatic retightening. This function increases the clamping force proportionally to the cutting force of the tool during the drilling operation. That way slipping of the bit is prevented even under extreme loads. Due to the high precision of all the individual parts, there is very good concentricity of up to 0.05 mm. You don’t need it to be so precise? Then the ->SUPRA series is right for you.
1: Cone mount with tight tolerances for the highest driving force and precision
2: Metal body for external use in industry and trade
3: Automatic retightening function to increase the clamping force when drilling in a clockwise direction
4: Hardened flat jaws for the highest concentricity and holding force