Festool Centrotec compatible shank fitting. Heat treated tool steel countersink with a HSS drill. Adjustable for different length screws and can produce a 9.5mm (3/8 inch) diameter counterbored hole for woodplugs. The drill produce pilot holes only. For sale in UK and Eire only. Dimensions: D=3/8 inch D=9.5 mm D2=3/32 inch D2=2.5 mm Shank Diameter=Centrotec Compatible Screw size Softwood=No.6 Hardwood=n/a Delivery=UK & Eire only Shank Diameter: Centrotec Diameter Imperial: 3/8 Diameter Metric: 9.5 Diameter 2 Metric: 2.5