Dual groove shank fitting. For standard quick chucks and also Festool Centrotec compatible shank fitting. Magnetic holder for 25mm insert bits. Quick and easy to use. Chrome Vanadium steel for longer life. Stainless Steel holder. Dimensions: D=10 mm Overall length=150 mm Shank Diameter=1/4 inch hex Shank Diameter=Centrotec Compatible Shank Diameter: Dual Groove Diameter Metric: 10 Overall Length Metric: 150