Dual groove shank fitting. For standard quick chucks and also Festool Centrotec compatible shank fitting. Quick release bit holder for 25mm insert bits and quick change power groove bits. Quick and easy to use. Chrome Vanadium steel for longer life. Stainless Steel with aluminium barrel. Pull back barrel to release bit. Dimensions: D=15 mm Overall length=150 mm Shank Diameter=1/4 inch hex Shank Diameter=Centrotec Compatible Shank Diameter: Dual Groove Diameter Metric: 15 Overall Length Metric: 150