End Mill Holder, HSK-A 63, Projection: 100, Clamping Diameter D1: 6mm GARANT: All shanks hard turned for smooth running!.Overhang dimension A: 100 mm External Dia D: 25 mm Spare clamping screw No. HSK mating faces machined. 30 9900: 6 Note: HSK 40 and 50, Form A and E available ex works by the manufacturer.