HMH Shank Adapter Tool fits in any vise and gives you the best hold on any straight shank (greater than 0,89 mm (.035") diameter). Also can hold plastic or metal tubes up to 2,38 mm (3/32") diameter.  Comes with two pins to stiffen platic tubes.

Length of the tool is about 5 cm. Length / diameter of the pins are 48 mm / 1,05 mm and 46 mm / 1,6 mm.